Accuphase Pro-5 problem

[el156]

Hi ! I have a Accuphase pro-5 from a friend to repair, it uses 9 2SA1302 and 9 2SC3281 each channel, and i found one 2SA1302 and one 2SC3281 shorted in L channel, all the other are OK, and turned amplifier on and it works even without this 2 transistors, and my question is : what could cause that ? and if i replace only those 2 transistors and the capacitors in the board, should it be OK ? What else should i replace to make sure all is OK ?

Thanks friends
Silvino