What was found
UNABLE TO MAINTAIN PRESSURIZATION WITH BLEED SELECTOR AT NORMAL AT 250' PRESSURIZATION IS STABLE AND WITH IN LIMITS IN MAX POSITION. RETURNED TO FIELD. LANDING UNEVENTFUL. INTEROGATED CDS NO FAULTS FOUND IN CPC PG OR ECS PG. PERFORMED DVI OF ALL DOOR SEAS NO DEFECTS NOTED. PERFORMED OPS TEST OF BLEED AIR SYS IAW AMM TASKS 36-11-00-710-802 NO FAULTS NOTED. PERFORMED FUNCTIONAL TEST OF THE PRESSURIZATION CONTROL IAW TASK 21-31-00-720-801 FUNCTIONAL TEST GOOD. UNABLE TO DUPLICATE AT THIS TIME. RETURNED TO SERVICE. NO PARTS REPLACED.