As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JFK - FLT 619 - EN ROUTE JFK-SDQ, CABIN UNABLE TO MAINTAIN PRESSURIZATION IN AUTO AND MANUAL MODE. RETURNED JFK AND LANDED WITHOUT INCIDENT. RIGHT PACK FOUND WITH RUBBER BOOT CUT BY CLAMP AND LEAKING. REPLACED BOOT AND CLAMP. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)