What was found
DURING CRUISE AT F360/M.77, STAB TRIM RUNAWAY AURAL SOUNDED WITH ASSOCIATED STAB CH1 INOP STATUS MSG. COMPLIED WITH IMMEDIATE ACTION ITEMS. WITH THE AUTOPILOT & TRIM DISENGAGED, ACFT SLIGHTLY OUT OF TRIM NOSE DOWN AT 2.3. EXITED RVSM AIRSPACE & ACFT FELT TRIMMED FOR 260 KIAS. COMPLIED WITH QRH AND CONTINUED A FLAPS 20 APPROACH & LANDING AT ORD WITH STAB & MACH TRIM DISENGAGED. TOUCHDOWN ABOUT 300FPM WITH NO BOUNCE. TRIM STILL DISENGAGED AT GATE. REF AML 1949052, INTEROGATED MDC & FOUND FAULT 007959 FOR HSTA STAB CHANNEL 1 MOTOR. TROUBLESHOT PER FIM 27-42-03 & CONFIRMED MOTOR 1 TO BE FAULTING. R & R HSTA CHANNEL 1 MOTOR IAW AMM 27-42-03. OPS CHKD GOOD, CAN NOT DUPLICATE FAULT AT THIS TIME. COMPLIED WITH CAT II RTS, TEST TASK CARD.