What was found
STAB OUT OF TRIM LIGHT ILLUMINATED ON DESCENT. RAN QRH AND STABLIZER DID NOT RESPOND TO ELECTRIC TRIM IMPUTS. RAN STAB TRIM INOP QRH. MANUAL STAB TRIM OPS NORMALLY. R & R STAB TRIM NOSE DOWN LIMIT SWITCH S145. COMPLETED STEPS (A) THRU (E)(1)(C) IAW AMM 27-41-94. FAULT STILL EXISTED. R & R STAB TRIM MOTOR. COMPLETED STEPS (A) THRU STEPS (G)(5)(D). AT FLAPS FULLY UP & FLAPS FULLY DOWN STAB TRIM STILL WOULD NOT GO NOSE DOWN TO ELEC STOP. STAB TRIM WOULD GO NOSE DOWN TO ELEC STOP AT FLAPS 15. REPLACED S145 IAW AMM 27-41-94 ADJUSTMENT GOOD. PERFORMED OPS CHK OF STAB TRIM LIMIT SWITCHES IAW AMM 27-41-94. PERFORMED SURFACE TEST SPEED/STAB TRIM TEST NR 60.32 IAW IFIM 22-11-00-810-D72, TEST PASSED.