What was found
DURING CRUISE FLIGHT AMBER HEADING MIS COMPARE DISPLAYED. WE NOTED A 8 DEGREE DIFFERENCE BETWEEN HDG1 AND HDG2. HDG2 MATCHED THE STBY SO WE REVERTED HDG1 OVER TO HGD2. AFTER LANDING THE HDG MIS COMPARE CLEARED AND ALL INDICATIONS ARE NORMAL. THIS IS THE SECOND OCCURRENCE. CORRECTIVE ACTION: REMOVED NR 1 AHRU DUE TO HDG MISMATCH. INSTALLED REPAIRED AHRU P/N 145130-3000 S/N 8256 IN THE #1 POSITION. REPAIR ACCOMPLISHED BY NORTHROP GRUMMAN, CERTIFICATE: DE.145.0114, WORK ORDER: 175808, DATE:12-22-25. ALL WORK COMPLETED IN REFERENCE WITH CITATION 680A MAINTENANCE MANUAL CHAPTER 34-20-10. COMPLIED WITH RFTS# 116058 REV.0. TECHS ADDED ONE WASHER BEHIND BOTH SCREWS ON AHRU #1 J1 AND J6 CONNECTOR, VERIFIED SECURE.