It's very easy to spend someone else's money, but...
Once you've gone to the trouble to remove it and you found all the junk in it, you should consider whether or not you want to do that again soon. If it's VERY easy to remove and replace in your trailer, you might take the risk to see whether it works or not, but there might still be a different problem that caused the PO to disconnect it, and the insect nests came later.
It's a 33-year-old propane appliance. Upgrading to a new one with a lower current draw on the fan motor and hopefully a few decades of trouble-free operation might be worth the money. I'd say it gets you a warranty, but IIRC Suburban will only give you a warranty if an authorized service center installs it. I have *NOT* looked that warranty detail up today so I may be wrong, but that's what I remember from buying an NT30 a year or two ago.
Il Carriaggio — 1975 Argosy 24 | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill