Power Transistor replacements Fender Frontman 212r

I've replaced both power transistors, drivers, mains and LV electrolytics and the LV and rectifier diodes but when I turn the amp on I get this hum almost like earth. Channel switching works, if I plug a guitar into it I do get signal but very dirty even though there is volume which leads me to believe that it's not power transistor related. I have checked the voltages all seems correct. So it could be power transformer problem or something in preamp rail. I noticed that the 2 led diodes D5 and D6 don't light up at all. Just wondering if anyone had any ideas because this one has left me stumped. Also what sort of replacement would I need for those 2 led's?
 
Check your power supplies, is there huge ripple on one or more? A failed main filter cap or just cracked solder to one will do that.

I call the way that amp is constructed a wedge chassis". It is narrow at front adn wide in read, so wedge shaped. MAny Fender solid state amps were made that way. I find inmany of them, the large filter caps vibrate enough to crack their solder.