As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOGPAGES:373542 AFTER T/O A/P WOULD NOT ENGAGE STUCK IN [NAV2 AP/OFF BOXED IN AMBER] CYCLED LANDING GEAR THINKING GROUND SENSE NO HELP CYCLED A/P PADDLES NUMEROUS TIMES RAN OUT OF IDEAS RTB. R&R EPCU THROUGH STEP B10 REF AMM 24-08-01-4. STEPS B11, B12, B13, B14 AND B15 STILL NEED TO BE COMPLIED WITH. COMPLETED REMAINING STEPS 11-15. EPCU OPS TESTS O.K. AIRCRAFT O.K. FOR SERVICE.