Roland vk 7 korg cx3 rhodes stage

Just signed up.I have these three boards and do alot of repairs on rhodes .The Korg had its volume fade away to nothing over the years and don;t know enough about it to repair, but I believe output caps ?HELP! … The Roland plays but has been abused including a major drink spilled all over the keys, they stick and whole thing is nasty.but just time and cleaning. Question,do replacement key have the weights in them or can the weights be had? Didn;t see in the list, but I know I could make them,just need the specs. Are the button LED’s available? Is a service manual PDF available? Would like to hear from other vintage single purpose board players.I’m hopin to get an Oberheim 3 squared and yam cp70