Well, I can tell you a little about my DA-P1 problems.
I bought a unit a few years ago that purportedly only had 50 hours of use. I was slow getting mics so I patched for a few shows, maybe 10 or 12 over about 4 or 5 months. I started getting the "T-Cut" error and it would not record or play. I sent it out to Tascam in SoCal and the guy calls me back and says my heads are cooked. I explain that there is <100 hours of use and he calls bullsh!t. HE then tells me that the DA-P1's head's and guts are all one unit...$475 for repairs. The only thing left on my old deck is the outer case.
Best of luck, Kevin.
PS, if you send it to Paul at Pro-Dig ask him when it was last serviced.