As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 305 - CREW NOTED MFDU MESSAGE WING ANTI-ICE LOW CAPACITY. SHORTLY THEREAFTER, THE TAIL ANTI-ICE FAULT ILLUMINATED. FLIGHT RETURNED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE FOUND THE LINE FROM THE LEFT ENGINE TMSOV TO THE PNEUMATIC THERMOSTAT LOOSE AND TIGHTENED IT. (M)