I recently picked up a used MFJ-993 (not the B version) tuner as part of a package deal that came with a storage unit auction. Condition was unknown, so I bought it caveat emptor. It powers up fine and all diagnostics pass, including all of the relay checks, but the unit does not tune. The frequency counter even displays the correct frequency when I transmit, but again, it does not tune and the display always shows a 1:1 match. Any suggestions on what I should check next? BTW - I also have the B version which works great. This is nearly identical, except for not working as it should.