As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 750 SJU-MCO, AIR TURNBACK TO SJU DUE TO BLEED 2 LEAK EICAS MESSAGE DURING CRUISE AT FL 300. THE QRH DIRECTED THE CREW TO SHUT-OFF THE AFFECTED BLEED. AT THAT TIME THE A/C HAD NR 1 BLEED SYSTEM ON MEL LEAVING THE A/C WITHOUT ANY BLEED SYSTEMS FOLLOWED BY LOSS OF PRESSURIZATION. REMOVED AND REPLACED NR 2 ENGINE PRECOOLER PER AMM 36-11-08. OPS AND LEAK CHECK GOOD.