What was found
SPEED TRIM FAIL LIGHT ILLUMINATED. (GROUND MAINT. WRITE-UP). GROUNDED - YES. ACCOMPLISHED DFCS BITE SPEED & STAB TRIM, FOUND ELEV POS SEN-2 FAULT. RESEATED POSN SEN-2 PLUG RAN BITE AGAIN PASSES NORMAL NO FAULTS BUT SPEED TRIM FAIL ILLUMINATES AGAIN REF B737-800 AMM 22-11-30-820-801. ACCOMPLISHED B737-800 FIM 22-11 TASK 849 "SPD TRIM FAIL LIGHT" FAULT ISOLATION, SHOWS "SPD TRIM WARN" FCC-B #22-11323. PERFORMED FIM 22-14 TASK 808 & AMM 22-11-00-740-806, SPD TRIM SYSTEM OPS CK NML.