The shutter of the camera is jammed with the mirror partially lifted.I remove the mirror block, and everything gets unlocked at once! Only remains to reassemble, making sure everything works perfectly. And readjust the focusing, since the assembly carrying the mirror and pentaprism has been removed.
I take this opportunity to replace the old (organic) grease of the cocking mechanism.
As well as the foam holding the pentaprism.
The pentaprism wedged with the new foam.Remains to close the body and send it back to it's owner.