Hi Deane,
Had a similar situation with my Roland FR-7X accordion, but instead of smudges the keys (abt 8 of them) were scratched. The accordion was about 3 months old at the time. Actually, some of the scratches were more like gouges. The deterioration seemed to be an ongoing thing.
Took the accordion to Audio Electronics, a Roland service center, there in Dallas and the keyboard was replaced under warranty. No questions asked! No determination was ever made about the cause.
Audio Electronics does excellent work! Sure beats sending the board out to LA!
Good luck,
Don P
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GENOS, Roland FR-8X V Accordion, Bose Compacts.