What was found
FLT#530, MCO-BQN. (AIRCRAFT PERFORMED AN AIR TURN BACK TO MCO) ON CLIMBOUT, FA CALLED AND INDICATED DOOR 1L PRESSURE LIGHT ILLUMINATED WE WERE AT 3500 AND LEVEL D OFF. DOOR PAGE SHOWED 1L DOOR UNARMED-RETURNED TO MCO AND LANDED AT 147,200 VAPP 135 LANDED AT 250FT/MIN; DURING INSPECTION FOUND PROXIMITY SWITCH FIN-4WN1 LOOSE. ADJUSTED SWITCH 4WN1 IAW AMM 52-71-00. ALL OPS CHECK OK. NO OVERWEIGHT LANDING INSPECTION REQ NO GENERATION LOAD 15 IAW 05-51-11. NO MX ACTION REQ AIRCRAFT OK FOR SERVICE.'