I would try these:
1) Remove all power (including the fuse holder behind the unit) and wait 1 minute before restoring power. This may reboot the unit and allow normal operation.
2) Remove the screws holding the unit into the wall. Sometimes the radio can be twisted that causes the tray not to move.
Other than that contact Bob Fields by PM and see if he has any idea where to go from there.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW