Yes, I know.................
I've read all the threads, and these are not well regarded radios. ;-)
However, the one on the Osprey I'm resurrecting was working, but has now failed. (Display vanishes intermittently, and there is a pulsing "white noise" sound from the speaker.)
I think I made the mistake of leaving the radio in the console during a shower of rain!
I've looked on the back for a ventilation screw, and there isn't one. Was this "feature" removed at some time in the life of these radios?
Next stage is to dismantle it.............
And the stage after that is probably to replace it with an ICOM 501 which is becoming available after I fit an ICOM 505 to another boat.