As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE BOTH AUTOPILOTS WOULD NOT RE-ENGAGE AFTER AUTOPILOT A DISANGAGED SUDDENLY, I NOTICED AUTOPILOT DISENGAGE BAR SLIGHLY LOW AND ADJUSTED IT AND BOTH AUTOPILOTS WERE THEN FUNCTIONAL, BAR COULD BE LOOSE. GROUNDED - YES. PERFORMED LAND VERIFIED TEST PASSED, NO DEFECTS NOTED B737-900 AMM 22-11-00-706-801, NO HISTORY 60 DAYS.