What was found
AFTER TAKEOFF THE "FWD CAB" ZONE TEMP LIGHT ILLUMINATED. AFTER RUNNING THE QRH, THE ZONE TEMP DID NOT GO OUT. THE FORWARD CABIN'S TEMP IS O/K AS PER THE FLIGHT ATTENDANT. GROUNDED - YES. CHECKED AND RELEASED PER MEL 21-1G, ONE PACK INOP RIGHT HAND, COMPLIED WITH PROCEDURES (MTX) PER B737-900 AMM 21-00-00-040-085. FWD CARGO HEAT DUCT CLOSED POSITION, RIGHT AIRFLOW SHUTOFF VALVE CLOSED. CONFIGURATION CHANGES HAVE BEEN C/W. COMPLETED R/H PACK DEACTIVATION BY CLOSING C/B P6-4 C-5. FWD PACK ZONE LIGHT EXTINGUISHED. DEFECT CLEARED.