This Kawai Session Trainer / Drum machine had no power.
1st Inspection did not reveal enything, until I removed the power board.
Two of the power caps blew, leaking electrolite over the pcb.
I removed the dead caps and all surrounding components.
I then scrubbed the PCB with a wire brush.
I tinned the PCB to protect it, made new links, replaced the caps & refitted the remaining components.