blues deluxe repair

[quex]

hi, i'm brand new here. i have been reading some of the other threads about blues deluxe issues, and mine is different so i would love some help. when i turn mine on everything powers up fine, but then as soon as i flip the standby switch it emits a deafeningly loud hum/buzz sound. i opened it up, and noticed browning of the circuit board around r85 and r86 and also cr22 and cr23, just like lobes had in this thread, except not as severe. i will post a picture soon. i already have the 470 ohm resistors in r85-86. i am VERY new to all of this, but i have been reading up on how to repair electronics, and i am going to go buy a multimeter tomorrow ($20 craftsman is good enough? can't afford the $200 ones) to take some measurements. any help with figuring out what the problem is and how to fix it will be hugely appreciated!