With MANY thanks for finding the video here on AppliancePartsPros, we diagnosed the problem of why the flapper door on the ice dispenser would not close, thus letting warm air into the freezer through the ice chute causing frost and ice build-up and a non-functioning ice dispenser.
WARNING - be prepared to see what lurks within!
The video showed us how to remove the front touch panel (popped out using a flat screwdriver), then showed how simple it was to remove the 4 screws (phillips-head) to remove the covering to expose the ice chute, water line, and - the culprit - a very rusted and mold-covered solenoid. The moving part of the solenoid, the top where the hook of the flapper door attaches, was so encrusted that it was "frozen" in place - that's why the flapper door always remained open.
Ordered the part right away from AppliancePartsPros and it was in hand in two days.
Before getting into the project, before disconnecting the power, we soaked the three very rusty screws that held the solenoid and the two that held the flapper door with 3-in-1 oil ... that suggestion isn't in the video, but seeing so much rust we feared the screws might break when removing them.
After a couple of hours, and following the straight-forward instructions on the video, we disconnected the power and disconnected the leads on the back of the touch panel (they didn't slide out easily - we had to use a flat screwdriver to gently pry up the catches). Although we were working in a rather tight space, it was easy to remove the solenoid and flapper door.
The warning given above about "what lurks within" is that black mold was everywhere. Horribly disgusting, but makes complete sense. That area, including the solenoid, is exposed to moisture all the time, but there is no air flow in that space to dry it up. Therefore, it is a prime location for mold to flourish. We thoroughly cleaned the entire area with white vinegar (bleach would work, too), and then dried it well. SUGGESTION to all - because it's so easy to get in behind the touch pad and workings of the ice/water dispenser, it makes good sense to periodically clean that area to prevent mold.
Using the video's detailed instructions, it was a simple project to screw in the new solenoid, and reattach the flapper door, then reattach the leads to the back of the touch panel, screw the cover back on and pop the panel back into place.
This DIY repair is simple and relatively quick to do and requires only a flat screwdriver and a phillips-head. The "time-consuming" part is letting the 3-in-1 oil do its work and then cleaning away the mold. But the actual task of replacing a solenoid from start to finish takes about 30 minutes.
Note: unsure of the actual model number, but we have a GE Profile Artica side-by-side. PSS29NG?