As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5561- STAB AND MACH TRIM WILL NOT STAY ENGAGED. RETURNED TO GSO AND LANDED WITHOUT INCIDENT. PERFORMED INTERROGATION OF HSTC, INDICATES GREEN, NO DEFECTS. CLEARED BOTH YOKE DISCONNECT SWITCHES AND ENGAGED SWITCHES ON PANEL. GROUND OPERATIONAL CHECK SHOWS NO DEFECTS AT THIS TIME, REF AMM 27-41-00.