The end of an old song

My beloved Ricoh GXR, which I have had since 2012 and which still, I think, produces lovely B/W, started doing this half way through a walk today. It works fine but everything is catastrophically overexposed: I suspect the diaphragm is stuck open. This is a small thing in the current crisis, but it's still sad: it was (is) a lovely camera, Ricoh make no modern equivalent and I seriously don't want to have to learn how to drive a new camera.

Perhaps it will be repairable.