As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#2231, BOS-LGA. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) 'DURING CLIMBOUT IN ICING CONDITIONS BLEED 2 FAILED UNABLE TO RESET PER QRH RETURNED TO BOS TO AVOID ICING CONDITIONS; REMOVED AND REPLACED PRSOV IAW AMM 36-11-03. OPS GOOD. AT THIS TIME NO FAULTS.'