As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PITCH AND ROLL ANNUNCIATOR ILLUMINATED ON CAPTS EFIS IN FLIGHT. PITCH UNRELIABLE, MORE THAN 6 DEGREES THAN F/O EFIS ATTITUDE. PITCH ILLUMINATED ON GROUND DEPOWERED AND REPOWERED. TAXI TEST OK. PROBLEM REOCCURRED IN FLIGHT. REMOVED AND REPLACED NR 1 AHRS COMPUTER IAW 34-21-01, OPS CHECK GOOD.