$60 · Yamaha PSR 292 (one iffy key: B) with stand

Yamaha 292 keyboard (61 keys) with a stand. One of the B key (second photo) is not functioning properly. It works normally at times but sometimes it make a louder sound than other keys or produce no sound (despite the same pressure applied). Other keys still sounds great. I don't have the skills or the patients to repair it.