Yamaha RM1X section/track keys

ok so I have an old yamaha rm1x that i use as a sequencer

some of the section/track keys are not working when pressed. somethimes, if pressed hard enough, or enough times they work. mostly though they dudd.

I guess maybe dust on the circuit boards etc etc any ideas how to cure/fix DIY?

coming from a guitar background I remember using switch cleaner for crappy controls on older guitar amps. anyone have experience using such things on internal boards of drum machines??

any help greatly appreciated.

I used to have an RM1X, loved it! Wish I never sold the old beasty now. I would recommend a can of compressed air, take the top blue panel of the Yammy and have a squirt.

Wicked for a hardwear sequence, the sounds are shit but the seq. block is dope.

easy now