Isn't EGR valve malfunction covered under warranty?

My Swift comes with a 2-year warranty and I have additionally purchased extended warranty for 2 more years. Since my car has not even completed 2 years, I was surprised when M/s PEBCO, Jamshedpur (Maruti authorized service station) stated that my EGR valve problem would not be covered under warranty and would be carried out on chargeable basis.

I reasoned with PEBCO that EGR valve cleaning is scheduled (as per Swift’s maintenance schedule) only at 30,000 km and if it has got clogged prematurely at 19,000 km, there must be some design / manufacturing defect and so its rectification should be covered under warranty.

PEBCO officials told me (as a justification for not covering the problem under warranty) that adulteration of diesel is common in India and this leads to excessive carbon formation which clogs up the EGR valve prematurely. I informed PEBCO that I always bought diesel from a reputed petrol pump in Jamshedpur and challenged them to draw a fuel sample from my car’s tank and prove that it was adulterated.

It is relevant to mention here that I had already discussed this issue with the petrol pump owner (who happens to be a qualified engineer) and he told me that some car service stations routinely raise the bogey of adulterated fuel to justify several problems in their respective cars and escape warranty liability. This petrol pump owner assured me that I could ask the diesel manufacturer (Indian Oil) for chemical analysis of the fuel sold in his petrol pump and defied any car service centre prove that his fuel was adulterated.

Despite all my reasoning, PEBCO refused to take a diesel sample from my car and stubbornly stuck to their decision not to cover my EGR valve problem under warranty.

Subsequently, I took up the matter with Maruti’s Regional Office at Ranchi. They agreed with my reasoning and directed PEBCO, Jamshedpur to rectify the defect in my car free of cost (under warranty). The matter was thus amicably resolved.

3rd (last) Free Service after 10,000 KM

Got the 3rd. free service carried out at PEBCO Motors workshop (MASS) at Sonari, Jamshedpur sometime back. Would rate their quality of work 5 out of 10. Specifically, the following issues need to be mentioned :
1) The workshop does not have the special tool to unscrew the engine oil filter housing cap. They used a 25 mm double ended spanner for it after removing the plastic engine cover (to create some space to move the spanner). I found this a very unsatisfactory arrangement which could damage the oil filter housing cap as well as some of the electrical cables leading to the glow plugs.
2) Both front doors make a rattling sound while closing when the glass is fully down. PEBCO mechanics tried to rectify this by putting some thermocole packings inside the door under the glass but failed.
3) I find it difficult to engage the reverse gear at times. PEBCO had no solution for it.
4) The service booklet specifies tightening of cylinder head bolts during this service (after 10,000 km). The workshop was not in a position to do this confidently and so this job was not attempted.
5) The mechanic attending to my car was not aware of '5-tyre rotation' and would have put the wheels at wrong places if it hadn't been for my intervention.

Clearly, Maruti Service leaves much to be desired.