Well, I found and fixed the problem with the front electro-coupler on my LC+ GP38. After swapping the front and rear coupler connections on the PCB, I confirmed it was a problem with the front coupler. After removing the electrical tape wrapped around the front coupler coil, I found one of the leads had a bad solder connection and had become disconnected:
I re-soldered the connection, and opted to cover the coil with a piece of heat shrink tubing instead of wrapping it with electrical tape:
So overall it was an easy fix. Although it’s a bit disappointing the electro-coupler would fail like this after a few years of ownership and not much run time.
