As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFLIGHT, 7MINS AFTER T/O, NR 1 INS WENT TO WRN WITH NO DISPLAYS. NR 1 ATT FLAG AND NR 1 HDG FLAG APPEARED AND A/T WENT INOP. SWAPPED NR-1 INS NAV UNIT WING NR-3 INS NAV UNIT. TESTED NR-1 INS NAV UNIT PER AMM 34-41-03. CHECKED GOOD NO ACTION CODES.