What was found
UNABLE TO CONTROL FLIGHT DECK TEMP EXCESSIVELY COLD NO NON NORMAL. REPLACED TRIM AIR MODULATING VALVE IAW 21-61-21. PERFORMED INITIAL EVALUATION PER FIM 21-62 TASK 901. CONTROL CABIN TEMP INCREASES & DECREASES WITH TEMP SELECTOR ON R & R TRIM AIR PRSOV IAW 21-62-01-000-801, 21-62-01-400-801. PERFORMED PACK TEMPERATURE CONTROL BITE PROCEDURE PER FIM 21-62 TASK 801. NO FAULTS NOTED. PICTURES ADDED. CONTINUED FAULT ISOLATION PROCEDURE. CHECKED VOLTAGE AT TRIM AIR PRSOV CONNECTOR D3914 PIN 1. READS 28V DC. PER FIM 21-62 TASK 901 STEP F.(3) (C), NEXT STEP IS TO REPLACE TRIM AIR PRSOV V146. REMOVED AND REPLACED CONTROL CABIN TEMPERATURE SELECTOR.