As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3329 THE CREW REPORTED THAT ON TAKEOFF HAD A RED FLAG ON THE INTEGRATED STANDBY INSTRUMENT SYSTEM (ISIS). THE INTEGRATED STANDBY INSTRUMENT SYSTEM (ISIS) WAS INOPERABLE. THE CREW RETURNED TO DFW. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. RESET ISIS, THE TEST WAS GOOD IAW AMM 34-01-01 AND NO FAULTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.