I've run into a few of these GE bottom mounts with this problem. I install a braided heater, SH201
, in the defrost drain. Wire it up in parallel with the defrost heater so it only comes on during defrost. A copper wire won't work because the drain is so far away from the defrost heater. There may be an official GE repair that I'm not aware of. Don't remove the drain trap, it will cause more problems.