Tascam MF-P01, Porta02 (MKI or II), 414, 424 MKIII service manuals?

[TB__]

So, I have been looking all over for service manuals of the deck mentioned above. I thought I’d give it a try over here, though numerous requests of others don’t seem to have resulted in any replies.

I don’t get why it is so hard to get, while being obsolete technology (at least as I see it). Does Tascam perhaps still repair these decks?