As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1105, JFK-ORD. (AIRCRAFT PERFORMED AN AIR TURN BACK TO JFK) ' AT FL 220 W/ICINGS WE HAD A BLEED 2 FAIL EICAS. THIS LED TO THE CABIN LOSING PRESSURE. IT ENDED UP COMING BACK ON ONCE WE TURNED APU ON; TROUBLESHOT PER FIM TASK 36-10-00-810-810A. REMOVED AND REPLACED #2 NAPROSOV. OPS CHECK GOOD. NO FAULT NOTED AT THIS TIME. OK FOR CONT SVC. MULTIPLE BLEED CHECKS PERFORMED UNABLE TO DUPLICATE FAULT. REF AMM 36-11-03.'