What was found
FLT#1755, BOS-DCA. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' AFTER TAKEOFF AND CLIMBING THROUGH 800', BLEED 1 OVERPRESS CAUTION. QRH COMPLETE. PSI OVER 120 UNTIL THRUST LEVER IDLE. AT IDLE PSI 20. RETURNED FOR NORMAL LANDING, BLEED 1 FAIL CAUTION. CABIN PRESSURE IS NORMAL. (ENGINE BLEED VLVS- SINGLE- SECURED CLSD)' (SUPPLEMENTAL TO FOLLOW)