As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CAPTAINS ATTITUDE INDICATION HAS FAILED 4 TIMES. THE VERTICAL GYRO HAS BEEN REPLACED WITH DIFFERENT SN GYROS. THE ATTITUDE INDICATION WORKS FINE AFTER EVERY GYRO CHANGE. TALKED TO OVERHAUL FACILITY & WAS TOLD THAT THEY HAD A BAD RUN OF NEW BEARINGS. WE WILL SEND THE LATEST GYRO BACK TO THE OVERHAUL FACILITY FOR TESTING. IF TEST IS OK, WE WILL REPLACE THE ATTITUDE INDICATOR.