As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT DIVERTED DUE TO AN INOP STANDBY ATTITUDE INDICATOR AND ORD WEATHER RESTRICTIONS. FOUND INOPERATIVE STANDBY ATTITUDE INDICATOR. REPLACED STANDBY ATTITUDE INDICATOR. REPLACED STANDBY ATTITUDE INDICATOR. TEARDOWN OF STANDBY ATTITUDE INDICATOR FOUND BAD REDUCTION GEAR ASSEMBLY. REPLACED ROTOR, ALL BEARINGS, AND REDUCTION GEAR ASSEMBLY.