As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT THRU FLT LVL190 AUTOPILOT A DISENGAGED & WOULD NO IMMEDIATELY RE ENGAGE. LNAV + VNAV MCP LIGHTS ALSO EXTINGUISHED AND WOULD NOT DIM. REENGAGE FLT DIRECTOR BARS BOTH SIDES WENT AWAY. RECYCLED FLT DIRECTOR FEW TIMES. EVENTUALLY LNAV, VNAV, FLT DIRECTOR BARS +A AUTOPILOT ALL ENGAGED. GROUNDED - YES. PERFORMED DFCS BITE CHECK REF B737-800 FIM 22-11-00-810-801 OPS CHECK GOOD. NOT ABLE TO DUPLICATE FAULT. NO HISTORY IN THE LAST 30 DAYS.