Hi Ken, I have the same problem with my E-182. It'll take a zappin only to return in a little while. I wondered if a magnet would attract their furry butts. WD-40, friend or foe? Dendrites seem to live an elusive mysterious life. Congrats on getting your keyboards open. If the H is anything like an E you'll find that your drum machine etc. can be plugged into the old brush input to the power amp. Kinda the way to go. Harp sustain is a tough one. Mine has one clunker key that pops. Looks like a research project. I'm interested in peoples thoughts on the dendrite remedy. I'd also like to know the basic skinny of opening up the keyboard to get at em.