I have been taken for a ride by the Whirlpool Service guys n number of times as most likely than not you have too. If you figure out the system u could diy repair or make sure that the service man is qualified or some anadi sent by the service co. In India the multi-meter is an alien object to the repair guy. No wonder we face shoddy service.
The 7 year contract of my Whirlpool FF 350 L Elite model , imported from brazil, REFRIGERATOR BRASTEMP BRM35A 350 FROST FREE just ran out, and the way the service standards of whirlpool are, continuity tester in hand i bravely decided on doing the faultfinding myself. Actually most FF fridges are similar and the same rules apply to most fridges..
Chk out my Detailed Faultfinding Post Here
https://techntrek.wordpress.com/2012/12/01/fridge-testing-fault-finding-and-basic-repairs/
Tech and Trek 