What was found
(CAN) AFTER TAKEOFF CREW REPORTED THAT BOTH CHANNELS OF THE STAB TRIM DISCONNECTED. CREW REPORTED THAT THEY WERE UNABLE TO RESET EITHER CHANNEL. AFTER LANDING CREW REPORTED THAT THEY COULD RESET BOTH CHANNELS, OUTSTATION MAINTENANCE PERFORMED A DOWN LOAD OF THE MDC. INDICATIONS SHOWED POSSIBLY POBLEM WITH PILOTS DISCONNECT SWITCH, MAINTENANCE WAS UNABLE TO DUPLICATE PROBLEM. MAINTENANCE DID A SYSTEM RESET AND FULL BITE TEST OF THE STAB HSTCU, NO FAULTS NOTED. MAINTENANCE PERFORMED FULL SYSTEM CHECK OF STAB NO DEFECTS NOTED, AIRCRAFT RETURNED TO SERVICE.