You are in LA? Why not call into Blue Water photo and ask for an opinion, They are in Culver City. I have called in there a couple of times and they have been very helpful - you want to check if the vacuum electronics are working if they are not there is $$ there to replace. I would think it would need a complete disassembly and service to allow you to clean all the gunk out.
Find out out how much a complete overhaul would be and see if that cost plus the housing price would still be reasonable.