First let me say I am writing this as specifically a compliment, when I know many would come to this site with the exact same circumstances and rant out a complaint. The bad, I have a GE Monogram built-in Refrigerator (ZISB48) that was not cooling below 58 degrees on the fresh food side. The freezer was fine. It took a month to get the back ordered parts and 4 service calls to fix. I missed almost 20 hours of work waiting for service.
They put in a new damper control, door, fan switch and ice dispenser door to try and rectify. That still didn't work. Finally it was determined that when the refrig control failed, it iced the return air flow to the freezer. An area not viewable between the two sections in the body of the unit. So even though it theoretically should have been working after the second call, it turned out it still needed to stay off for a day to melt out the blockage-something no one realized.
The Good. This was a rare one in 1000 problem. GE always came back with timely service calls to work on it while it was still failing, never charged, and the techs took a great interest in resolving the problem. They spoke with other GE techs till finally one had a similar scenario and were able to diagnose it properly. The tech then called me almost daily to monitor how it was cooling. Today we closed the ticket. No, it wasn't a great thing waiting around 4 different days and using a little bar frig for a month, but under the circumstances, I think it couldn't be avoided. That being said, I thing GE deserves some credit for at least appearing they wanted the box fixed as bad as I did, and their actions showed it.
I've seen a lot of complaints here about other service centers that hardly give any effort to solve simpler problems. While I may not buy one in every instant, I will say you can never go wrong buying a GE appliance when in doubt.