This may take a little while. There does appear to be a back panel, but not necessarily a lower one. I'll let you know about the coils once I get to them.
Removed 4 screws, all shelving and slides, and the two light bulbs, but that panel is being blocked by the light fixtures and other features on the inside. I'm not sure how to get it off without major disassembly.
Assuming the coils are frosted up, what should be done? This problem began sometime after the refrigerator started up following several days shutdown (power outage following snow storm). Can I just turn off the freezer side, if that's possible, or the whole refrigerator, if necessary, and let it defrost?