There used to be a Mainship users group on Yahoo, but I think it may have gone under. Might look there just in case.
Welcome aboard TF
The Yahoo group is still around but has really slipped in usefulness IMO. All saved / filed content has been purged.
Many have come over to TF.
I have a link on my Bacchus website to a number of MS manuals but honestly the MS manual is of little use.
What is helpful is the individual manuals, installation instructions, service manuals for each major system or piece of equipment.
Some are available from the Bacchus site, some in the TF library and some others are online via search.
I started an excel spreadsheet of key parts, service contacts, etc. Happy to share... if you have questions once your deal is done PM me your email and f I have it I can send you what I have for specific items.
The website also has a searchable BOM for late model 34T/HT with a photo of the part with source info for many but not all of the parts. Yours is a different model but many parts / sources are common on the MSs.
There is another link for parts for MS, Luhrs, Hunter boats but no BOMs so one has to scan through the thumbnails to find what you are looking for.
Rgano and others here have lots of knowledge and experience and are more than willing to help.
Good luck with the rest of the deal.