What was found
CREW REPORTED AT FL230 THE (AMBER) R EMER PRESS ON CAS MESSAGE CAME ON THEN CYCLED OFF THEN CYCLED ON AGAIN. SHORTLY AFTER GOT THE (AMBER) CABIN DUCT OVHT CAS AND COULD FEEL THE CABIN TEMP WAS HOT, PER CHECKLIST INITIATED DESCENT. DURING DESCENT THE L EMER PRESS ON (AMBER) CAS MESSAGE CAME ON AND OFF JUST LIKE THE RIGHT DID, CYCLED THE EMER PRESS SWITCH A FEW TIMES THE LEFT MESSAGE CLEARED BUT THE RIGHT REMAINED ON. CLEARED AFTER PASSING THROUGH 8000 FEET. AIRCRAFT IS IN MAINTENANCE. UPDATE WILL BE FILED ON RECTIFICATION.