Garmin 45

Is there one? I thought the thing was nitrogen-filled and needed to go back to the ark if fiddled with. Having said that I've seen pictures of its innards on the net somewhere years ago. What's yours doing wrong? I bought mine in the late 90's and it still works OK.
 
I have 2 of 45 and a 48 for backups and I have the same problem with one of my 45's.

I was told only garmin UK could replace / fix.

If you find out what to do pls let me know.
 
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