...Update:
I replaced both TIP36c's on the flipper board last night. The fuse holders are spot on, so I left those. Fuses were tested with DMM to be safe..
Tested last night no probs / repeats of failures. The lovely played for about four hours this afternoon and no probs noted.....
So I will see how it goes for another week...If all good then I can look at getting my new DMD to finish...