What was found
***CREW REPORT: WE WERE CLIMBING THRU 14,000 FT THE CABIN LOW PRESSURE LIGHT ILLUMINATED. I CALLED FOR THE CABIN PRESSURE LO CHECKLIST AND WE STARTED RUNNING THE CHECKLIST (I HAD NO SYMPTOMS OF HYPOXIA) THE FO AND I WERE LOOKING AT THE CABIN PRESSURE INDICATOR AND WE WERE IN AGREEMENT THAT THE SMALL NEEDLE WAS AT THE 5 O’CLOCK POSITION AND THE BIG NEEDLE WAS IN THE 12-1 O’CLOCK POSITION. GOING THROUGH 23,500FT MY EAR POPPED AND THE CABIN WARNING HORN SOUNDED. WE CALLED CENTER AND TOLD THEM WHAT WE HAD AND REQUESTED A LOWER ALTITUDE AND A HEADING BACK TO OUR DEPARTURE AIRPORT. I IMMEDIATELY BEGAN AN EMERGENCY DESCENT AND BEGAN TO TURN BACK TO THE DEPARTURE AIRPORT.