I just changed new filter caps to my boogie. Although it was major upgrade to sound, there's still something going on when I'm hitting chords in lead mode. A kind of sound like speaker is broken. It's not and and tubes are ok too. ..and while changing filter caps I noticed.. there's 2 resistors missing(!) see upper picture. Looks like somebody has cut them away. I don't know if these 2 missing resistors are causing these problems of lead channel. And i don't understand why would someone remove these from circuit board. what are these missing resistors? any info is appreciated.