Foam air guides by evaporator in GE Monogram

I have a GE Monogram ZIFS36NMIRH built-in refrigerator/freezer pair. Every year or so ice starts building up on the bottom right hand side of the freezer. When this happens, I let it defrost and clean everything before plugging it back in, but the freezer ices up again over the course of the next year.

This time I followed the service manual to open up the evaporator assembly to look for anything amiss. The thing that stands out to me is in the manual where it says "Caution: The foam air guides on the left and right hand sides of the evaporator must be in place during reassembly." After removing the evaporator cover, I found that the right hand foam had fallen off the coils. Normally, the foam is placed over the coils, presumably to insulate them from the freezer lights that are situated directly outside the evaporator cover (which has been pulled aside here). See the attached image where I'm pointing at the tape that had presumably once kept the foam in place. On the left hand side of the evaporator, the foam is still in place.

Could this be causing my problems? What kind of foam can I replace this with? Or can I replace the incandescent bulb with something that generates less heat or are incandescent bulbs best?

Thanks!