As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSHBACK, F/O SPD AND ALT TAPES WERE LOST, CAME BACK INTERMITTENTLY. SWITCHING FMC NAV SWITCH TO BOTH ON L SEEM TO WORK FOR ABOUT 2 SEC ON T/O, A/T ARM SWITCH WENT TO OFF. AIRBORNE, CAPT LOST F/D AUTO PILOT WOULD ENGAGE IN CWS ONLY HAD FAINT ODOR OF SMOLDERING WIRE. REPLACED AIR DATA MODULE PER FIM, ALL CHECKS GOOD.