OrangyTang

Hello! Going through my parent's attic over xmas I rediscovered my old 12v train set, which I'm now trying to restore and get working again. After cleaning up a bunch of contacts with WD40 the actual train and power brick work, which is nice. However the remote control for the signals seems to be completely jammed and neither button will actually move. Has anyone successfully repaired one of these? I can't even see how to take it apart without breaking it. Thanks