I have the same problem on a samsung side by side with twin evaporators. I ohm'd the defroster & got no continuity. Did you do the defroster swap with the assy. in place or loosen it from the chassis somehow? I can't tell if the evap. assy, is riveted or screwed in place. It looks like rivets. I got an estimate of $200 to R&R the entire unit, but I'll have to wait 3-4 days. The evap. assy. runs around $50. Plus I would prefer not tampering with the freon closed system. Your solution sounds easier & simpler. Plus its DIY.