How are u testing the diodes? With meter on diode setting red lead on the end of diode with line and black common lead on other end record all the readings and let us know
as mentioned earlier all read ol except D51 & D53 0.712 & 0.704 and D52 & D54 start around 0.8 and climb until the read ol. Once this has occurred they will read OL.
D53 and D54 are linked as are D51 and D52
Also Q91 to Q98 tip 107's show ranges in 0.5 for outside legs and 0.00 middle leg except Q64 13N10L right leg reading 0.46 or so. All the other Q's 13N10L's read OL and 0.00 for middle leg
