As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DEPARTURE, THE PILOT REPORTED THAT THE NAVCOM2 FAILED. APPR2 NOT AVAILABLE AND AURAL WARNING SYSTEM FAULT. THE AIRCRAFT WAS HELD ON GROUND. MAINTENANCE PERSONNEL PERFORMED FAULT ANALYSIS IAW FIM 34-61-00-810-838-A, REPLACED THE NETWORK INTERFACE MODULE NR 2 IAW AMM 34-02-04-400-A. PERFORMED OPERATIONAL TESTS WITH NORMAL RESULTS, THEN THE AIRCRAFT WAS RETURNED TO SERVICE.