As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOPILOT A WILL NOT REMAIN ENGAGED. GROUNDED - YES. REMOVED AND REPLACED AILERON POSITION SENSOR IAW B737-900 AMM 22-11-29-000-801 AND AMM 22-11-29-400-801 AND ADJUSTED IAW AMM 22-11-29-820-800, OPS CHECK GOOD. THE LMM TESTS AND LLM STATUS OF AIRCRAFT AND THE ROTABLE PART CHANGE FOR THE NEW AILERON POSITION SENSOR WILL BE DOCUMENTED ON LOG PAGE 60192502. CLEARS MELS 22-1F, 22-4B, AND 22-99, CONTROL NUMBER 15062448 REMOVED, SEAMC DAN NOTIFIED, NO AIRCRAFT CONFIGURATION CHANGE.