On 24/03/2020 13:18, PeterC wrote:
Back door catch was staying in after opening the door; putting the handle up
forced it out (5-point locking).
Stripped and cleaned it, operated it on the bench whilst looking all over it
and spotted a grub screw by the latch part of the mechanism. It was just
getatable in one position, tried it and it was a couple of turns undone and
rubbing against the mech. Free after tightening.
Those mechs. are complex and all rivetted together, so if the screw had
dropped out...! £50-odd quid down.

Sorry - should have put OT.

Seems pretty on topic to me. I'd probably have added some loctite too.