Update 2
Just reloaded a save prior to AN14 where I was in AN13 after a successfull convoy attack. All dials are working as is Hydrophone. I am on the surface.
The save in North Scapa AN14 is where I ran around the convoy for a second attack. This save had all instruments working as I used hydrophones to do a sound search.
I did a duff torp attack at periscope depth which was when I reloaded to try a different strategy. Hydrophones was now stuck and a instrument check in the control showed the same problem.
Edit
Darn sorry Rubini, looks as if you sussed this previously and then answered this while I was back in the game faffing about
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