As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT A WOULD NOT ENGAGE. AUTOPILOT B OPERATED NORMALLY. GROUNDED - YES. PERFORMED DFCS BITE PER B737-800 FIM 22-11 TASK 801. FAULT 22-11281 A/P DISC S/W-1 IS STILL ACTIVE. REMOVED CAPTS AUTOPILOT DISCONNECT SWITCH PER B737-800 AMM 22-11-41-000-801. INSTALLED AUTOPILOT DISC SWITCH PER AMM 22-11-41-400-801 PERFORMED A/P SWITCH INSTALLATION TEST PER AMM SUBTASK 22-11-41-740-001 TEST IS GOOD.