As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM PHL TO CUN, CREW REPORTED THE STANDBY ATTITUDE INDICATOR FAILED. DECISION WAS MADE TO DIVERT TO CLT FOR REPAIRS. FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE STANDBY ATTITUDE INDICATOR. OPERATIONAL CHECK GOOD.