Panel Swap....
....Is only slightly less involved than divorcing a Kardashian.
The reason is that GE used a sliding shield to protect the window glasses during P*7 self-cleaning. These shields have to have their parts re-installed in exact alignment for the shields to work after the swap.
You need eighteen hands, each with nine fingers, for this job. I'm sure GE had jigs and other assembly aids to position everything for initial assembly, but we vintage GE fans don't have that luxury.