What was found
DURING ELEV FEEL COMP TEST - FAILED ELEV DUAL AUTHORITY TEST 51.27 - B CHANNEL OUT OF LIMITS. GROUNDED - YES. DID TEST OF "B" ELEV A/P ACT REF B737-800 AMM 22-11-26-820-801. A AND B WITHIN LIMITS AT 2.01. THEN RAN DUAL AUTHORITY TEST REF AMM 22-11-00-820-816 - STILL FAILS 51.27 TEST A -2.10 AND B -1.91. SUSPECT BAD "B" ELE A/P ACTUATOR. REMOVED AUTOPILOT ELEVATOR ACTUATOR "B" REF AMM 22-11-26-000-801 AND AMM 27-31-00-800-802. INSTALLED NEW "B" AUTOPILOT ACTUATOR. LEAK CHECK OK. REF AMM 27-31-00-840-802, AMM 22-11-26-400-801. COMPLETED ALL TESTING OF THE B CHANNEL ELEVATOR A/P ACTUATOR PER AMM 22-11-26/401. ALL TESTS NORMAL. TEST 51.27 NOW PASSES.