If you end up swapping it,go for a box that is later than 2003,they were upgraded and apparently more reliable.
I had to change mine last year after same symptoms as you,tried changing reverse piston first (which had sheared off altogether )but still was noisey and didn't operate properly.
There is a 'pin out' diagnostic on here that only requires a multimeter to test the box electrically.
Good luck,Ken.
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