Marshall 1987X U spec. USA

[clintronics]

This amp looks stock but the grid resistors are 2.2K ohm 4 watt.
I can't find a schematic that matches this.
Should I change these to 1K 5watters?

[Enzo]

Does it work OK this way? Is there some compelling reason to "fix" an amp that is working?

[clintronics]

Amp is dead. Output tubes are shot.

[Enzo]

Fair enough, I'd fix it as it sits, then consider new screen resistors once it works. I don't believe in modding amps that are not working already. Too much potential to add to the trouble or confuse the troubleshooting.