What was found
THE FLIGHT CREW REPORTED THAT A WARNING LIGHT ILLUMINATED AT 10000FT WITH NO OTHER ANNUNCIATORS. THE PRESSURIZATION GAUGE SHOWED NO PRESSURIZATION. THEY ALSO INDICATED THAT THEY COULD HEAR SOME TYPE OF PRESSURIZATION LEAK. THEY RAN THE CHECKLIST AND OPTED TO DIVERT AND LAND FOR MAINTENANCE CONSIDERATIONS. THE MAINTENANCE VENDOR DETERMINED THAT THE CABIN ALTITUDE CONTROLLER WAS AT FAULT AND REPLACED IT WITH A NEW UNIT. OPS CHECKS WERE GOOD, AND THE AIRCRAFT WAS RETURNED TO SERVICE.