OK, have you checked R01 and R02 recently? they are 8.2 ohm resistors near TR01 and TR02 ? - please do check them.
I was only going to suggest changing TR23 (either swapping with TR24) or for 'new' - so only one replacement unless you want a spare?
Problem is Mouser is out of KSC1845 at present - to replace the other transistor.
I was only going to suggest changing TR23 (either swapping with TR24) or for 'new' - so only one replacement unless you want a spare?
Problem is Mouser is out of KSC1845 at present - to replace the other transistor.