So you replace both transistors but you don't yet know if that's the fix.
True. The bulb is an auxiliary device, but your measuring instrument is the multimeter. Use it.
1) Measure both power rails, they should be somewhat lower than normal, because the bulb "eats" some "wall voltage"
Example: normal rails are +/-40V.
If you find something between 25 and 35V each, fine. Reasonable.
If you find , say, +/- 5V .... *who* is eating so much?. Abnormal.
In another Forum a guy's Aguilar 750 amplifier (over +/-70V rails) had perfect symmetical ... 1.9V rails. *Big* trouble.
2) measure DC voltage at the speaker out. You should have close to 0V there. Less than 100 mV in any case.
3) the fire test.
If your amp passes tests 1 and 2, hook the speaker and have it play some music.
You should be able to get at least 5 or 10W out of it, which is quite loud in a room.
If it passes the #3 test,
only then plug it straight into the wall, without limiter.
Do not skip repair stages, or you may make an expensive mistake.
You *may* get lucky of course, but don't count on that.