Desperately need wire schematic for older Nutone 3003 Intercom System. House has 4 locations plus intercom.

Desperately need wire schematic for older Nutone 3003 Intercom System. House has 4 locations plus intercom master. also one PFSW52.... any idea what this is? Finally there is a location in the house which I assume to be a chime or speaker location of sometime, however previous tennants ripped out whatever the device was.... however 3 2-conductor (possibly 4 conductor) wires meet at the "chime" location. Please advise -Daniel Also.... there are no stations working no communications between any of the "doorbox" locations nor the intercom master itself. I would assume - blown main board? short?... were these things notorious for this? THanks again in advance.

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