What was found
UNSCHEDULED STAB TRIM MESSAGE APPEARED INTERMITTENTLY. DISPLAYED FOR FEW SECONDS THEN DISAPPEARED. NIL MOVEMENT EVIDENT IN STAB TRIM GAUGE NIL EFFECT ON AIRCRAFT. NIL EXISTING FAULT, FOP M838 REPLACED IAW AM 27-58-01 IN P50 CARD FILE, MAD TEST 4/65 CHECKED OUT SATISFACTORY. ALSO 'L' Y/DAMPER STAB TRIM MODULE REPLACED OK IAW AM 22-21-04, STAB TRIM OPS CHECK SATISFACTORY. NIL MESSAGE EVIDENT RAY ALSO CHECKED OUT OK. Y/DAMPER STAB TRIM MODULE REPLACED SATISFACTORY IAW AM 22-21-04. NIL MSG EVIDENT STAB TRIM OPERATES SATISFACTORY.