Kenwood KR-9400 Humming Sound - HELP

[ExtraCharity]

Hey Folks, I believe I am the cause of this now annoying Humming sound. Received a KR-9400 for Christmas and have a pair of infinity rs525s hooked up and have been having a blast these couple of days. Got it from the original owner. Took it upon myself to remove the top cover and use some compressed air to remove decades-old dust. Turned it back on and now I have a loud humming coming from my speakers.

I am deadset on fixing this as the listening experience pre-hum was euphoric and I know my 50lb monster is capable of better.

Hum is coming from both speakers, gets louder as volume is increased. FYI

Please lend me the advice and experience to remedy this nuisance.

 

[LiveandLearn]

Welcome to AK. While you're waiting for one of our resident experts, here's a link to my humming problem thread:
https://audiokarma.org/forums/index.php?threads/my-kr-6200-is-a-hummer-sort-of.954013/
Got some great help and found/fixed the problem.