As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 2155 - EN ROUTE LGA-DFW, SHORTLY AFTER TAKEOFF DETECTED ALT WARNING IN COCKPIT. UPON DESCENT HEARD A SQUEALING NOISE IN COCKPIT. RETURNED DFW AND LANDED WITHOUT FURTHER INCIDENT. REPLACED LEFT SIDE PACK SUPPLY DUCT CLAMP. LEAK CHECKS GOOD. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)