What was found
IN THE CLIMB THROUGH 11,000 FT, THE FLIGHT EXPERIENCE SIGNIFICANT DOOR SEAL VIBRATION FOLLOWED BY A NR 1 BLEED FAILURE THROUGH 16,000 FT. THE FLIGHT LEVELED OFF AND FOLLOWED THE QRH WHICH CLEARED THE BLEED FAILURE BUT THE CABIN PRESSURE CONTINUED TO CLIMB. THE CREW ELECTED TO RETURN TO BASE. NO ADVERSE PASSENGER REACTION WAS OBSERVED. SPDA 2 DC POWER MOD IN SLOT 1 REPLACED IAW AMM 24-61-11 REF FIM 36-10-00-810-804A00, NR 1 ENG PRESSURE SENSE LINE CLEANED OUT, ENG RUN CARRIED OUT - NO FAULTS - CONSIDERED SERVICABLE.