As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SELECTING APU ON BUSSES, MCP ALTITUDE AND FD LOCKED UP. ACFT GROUNDED. DEU 1 AND 2 BITE SHOWS CURRENT STATUS FAULTS ON A/T, FCC A AND FCC B. CYCLED POWER TO MCP, FCC A AND FCC B COMPUTERS. OPS RESTORED TO MCP. OPS CHECKED NORMAL 22-11, TASK 803. HGS SENSOR TEST NORMAL REF AMM 34-36-00.