As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
Heading Hold will not hold heading with Auto Pilot in B channnel. Corrective action: Deffered Heading Hold per MEL 22-1, CI#M120076 per MX CNTL Mic. Replaced Mode Control Panel, operational check normal IAW MM 22-11-191, This clears CI#M120079. See A/C 120 Log pages 92740 and 92653. This report filed closed.