As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW DECLARED AN EMERGENCY INTO BOS ON ACCOUNT OF PRESSURIZATION PROBLEM. LANDED WITHOUT INCIDENT. BLEED 2 FAIL FOLLOWED BY LOSS OF PRESSURIZATION IN CRUISE. BLEED 1 WAS ON MEL. MAINTENANCE TROUBLESHOT IAW FIM TASK 36-11-00-810-837A, FAULT 36113001. FOUND NR 2 ENG FAN AIR VALVE JOINT CRACKED. REMOVED AND REPLACED THE NR 2 FAN AIR VALVE IAW AMM 36-11-09. OPS CHECK GOOD.