As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3890 -PRESS- DECLARED EMERGENCY INTO JFK DUE TO CABIN ALTITUDE WARNING. NO MASKS DEPLOYED. CORRECTIVE ACTION: PERFORMED LEFT PNEUMATIC HEALTH CHECK. FOUND PRSOV INOP. REPLACED SAME. NO HELP. REPLACED BAR. PERFORMED #1 ENGINE RUN. OPS CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.