I didn't have the model number for the a/c unit, so the manufacturer's consumer service guy (rather brusquely) said he couldn't help. I called the RV manufacturer (Forest River now owns Coachmen) and after a couple of emails, I got the info I needed to go find the ID for my unit.
|Model 57915.622, my old friend.|
Here's the thing: I'd poked around in there and not gone in deep enough. All it took was someone who knows these things to tell me it's in there somewhere, and I solved the problem. Sometimes knowing there is a solution is all it takes to find it.
Of course, by now the unpleasant Dometic guy has left for the day, so it'll be tomorrow before I can get the part number for the shroud and order it.
While all this was happening, Amazon delivered a fresh supply of spa chemicals and test strips. Not a moment too soon.