My chassis says PWB980801A and after being told to junk this amp I saw an article that said burnt components definately harm other parts.  The burned parts on my circuit board are 1.) ZD3, 2.)another ZD3, 3.)R111&270J DAEDO, 4.)R112&330J DAEDO, 5.)a blue resistor with 2 black and 2 red rings on it, 6.)desoldered TR10, TR15, TR6 & TR9.  When I lived at 522 Rhea Street in Long Beach, CA  someone I was living with asked me to take my guitar and amp outside and play.  I did but a policeman said he would have me arrested is I didn't go back inside.  I would like to keep this amp but it is kind of loud for the one room where I live.  All the repairmen I've found have refused to fix it.  I told ASCAP about VanHalen and got $5,000.00 and bought this amp in 1984.