What was found
AFTER TAKEOFF AC FAILED TO PRESSURIZE, RAN COM PROCEDURE 2.21.5. ON DESCENT EQUIP ENTRY LIGHT FLICKERD, RAN COM PROCEDURE 2.52.3. RETURNED TO DEN. INSPECTED BOTH E+E DOORS, FOUND TO BE SECURED AND INSPECTED E+E SWITCHES, NO DEFECTS NOTED. INSPECTED DUCTING AND PACKS OPERATION, OPS CHECK NORMAL. RAN ENGINES, PRESSURIZED A/C, OPS CHECK NORMAL. A/C OK TO CONTINUE SERVICE.