Hey Man.
your point
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1. I am observing that their is a keech keech keech sound when I start the vehicle and it will remain their for some time say, 5 to 6 KMS run for under idle for about at minute of so, after that it vanishes. I was told by service stations that it could be the noice of belts."""
This is the noise from the belt and happens normally for 3-4 mins after start. The solution is very light lubrication. Process. While the TATA guys wash the car, they wash the engine bay as well and during that, they spray a little quantity of diesel in engine bay. This makes it all go away.
enjoy and dont worry..
