Disassembly may not be necessary (and cleaning may work):
We were about to follow the disassembly procedure but - having seen the picture - decided to first try to simply pry off just the controller cap.
That worked nicely (the hooks are placed diagonally, the cap is rotated in the image)
exposing the contacts:
In my case there was little corrosion but the two malfunctioning contacts would only work sporadically when pressed directly (leaving it in the camera allowed for easy checking). Pressing the contacts repeatedly seems to improve their response, however, after putting the cap back on the old behaviour returned - non-function.
On a second attempt a minute amount of contact spray was applied to each of the contact plates and again the contacts were pressed a couple of times to “massage it in”. This time it worked and the controller seems to have regained its function on all contacts after refitting.
The contact spray may have been the crucial difference to the previously discussed attempts.
I hope it stays that way for a while … and that this simple procedure may help others
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