Hi all I bought a rcf 312a powered monitor to try to repair one fuse had blown inside I replied it and the horn seems to work but the woofer main 12inch speaker is distorted and very low I checked rail voltages and they seem to be ok I removed the sap16n and p and irfp140 irf9140 and checked out ok on multimeter i have made a signal tracer which works good just after a bit help where to check, the amp was in protect mode when I bought it i replaced fuse and It turns on with no protect inhave schematics I'll post help would be really appreciated I'm just getting into electronics fixed a powered monitor a while back and a great fender amp