What was found
AT FL230 SLOW DECREASE IN PRESSURIZATION CAUSING A CABIN PRESS WARNING WITH A DESCENT TO 10,000 CONDUCTED CABIN PRESS WARNING CHECKLIST, PRESSURIZATION FAIL CHECKLIST AND UNPRESSURIZED FLIGHT CHECKLIST. REMOVED FROM SERVICE. IN CDS FOUND ECS FAULT CODE 3101- PACK 1LT MISCMP MULTIPLE TIMES. REPLACEMENT OF PACK INLET TEMP SENSOR. COMPLIED WITH OPS CHECK OF PRESSURIZATION CONTROL IAW AMM TASK 21-31-00-710-801 ALTERNATE PROCEDURE 4B AND PARA 5. NO DEFECTS. RETURNED TO SERVICE.