As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 335 IAD-MCO, UPON DEP AT 1500 AGL - REQ'D BLEED 1 OVERPRESS EICAS WHILE RUNNING QRH. BLEED 2 IS FLUCTUATING FROM 2-98 PSI WITH BLEED 1 ALREADY ON MEL, ELECTED TO RETURN TO AIRPORT. NO OTHER EICAS MESSAGES REC'D. INSPECTED AND FOUND NR 1 NAPRSOV STUCK IN THE OPEN POSITION. REMOVED AND REPLACED NR 1 NAPRSOV IAW 36-11-03. PERFORMED HIGH POWER RUN, PERFORMED OPS CHECK OF BOTH BLEED SYSTEM IAW 36-11-00. OPS CHECK GOOD NO DEFECTS NOTED. NR 1 AND NR 2 BLEED SYSTEM OPERATING NORMAL. MDDR 118416 CLOSED.