What was found
(CAN) DURING CLIMB, FLOW LIGHT (PRESS) COME ON, UNABLE TO STABILIZE, ACFT LANDED BACK. FOUND AFT GALLEY DOOR SEAL NOT PROPERLY SEATED. DURING SECOND CLIMB, SAME FLOW LIGHT CAME ON WITH BOTH AIRCRAFT PACKS BETWEEN 0-2 PSI ACFT LANDED BACK AND ACFT FERRIED TO BASE. LT PNEUMATIC PILOT PRESSURE REGULATOR REPLACED ALSO RT PRESSURE REGULATOR VALVE REPLACED AND RT AIR CONDITIONING PILOT PRESSURE REGULATOR REPLACED.