As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING FLIGHT 12000FT, AUTOPILOT A WOULD NOT ENGAGE (RED LIGHT AND AURAL WARNING). AUTO PILOT B DID SAME - CONTINUED TO DESTINATION AT FL260. PERFORMED DFGS FAULT REVIEW TEST. FAULT MSG 22-11052. RADIO ALTIMETER #2 TRANSCEIVER FAILED. REMOVED AND REPLACED RADIO ALTIMETER #2 TRANSCEIVER PER AMM 34-33-21.