On our GE Profile fridge (PSCS5RGXCFSS) the Trough Drain Assembly (#815) had rusted and was spilling rusty water. The trough was not completely rusted-through yet, but close to failure. The root-cause problem was discovered as a zip-tie holding the mini-evaporator coils (#814) together on the left side bottom was not trimmed-off enough, and was deflecting the trough, tilting the trough away from the drain hole on the right. Some side-cutters clipping back the zip-tie fixed that issue. To prep the trough, I first coated it with Rustoleum cold galvanizing paint from Home Depot, as others had suggested. As a further measure, I caulked around the drain crimp with some bathtub caulk, and then sprayed another coat of the galv paint, and let cure two days. Unplug fridge. After shelves out, must remove tubing cowl on right wall (2 screws and grommets), allowing clearance to remove mini-evap cover along with Styrofoam insulation (3 screws). That reveals two more screws holding coil and trough in place. Loosen those screws just enough to work the trough up out of drain funnel at back right corner. Trim zip-tie(s) under coil if needed. Slide in new trough, with drain in funnel, and reverse steps to reassemble. Less frustrating than expected.