OK, just a few basic points to verify:
I set my DMM on the 200 Ohm range?
I can see the three solder points for each transistor on their boards. Do I test them in place or do they need to be removed? The latter operation would be way more than I would consider doing.
How do I tell the emitter, collector and base terminals apart?
Finally, do these questions make you want to shout "BACK AWAY FRON THE YAMAHA"?
To accurately verify a leaky or shorted condition at least 2 of the three transistor leads need to be isolated from the circuit. Short answer .yes.they need to be removed.Otherwise you will get misleading resistance values from the surrounding components within the immediate area of the circuit.