What was found
DURING CRUISE, BRAKE PRESS WENT TO 3000 PSI DEPRESSED PEDDLES, CYCLED BRAKE/A/SKID AND CYCLED PARK BRAKE, NO CHANGE. ALSO YELLOW BRAKE TRIPLE PRESS BREAKER PER MAINT INSTRUCTIONS, NO CHANGE. WHEN MAIN GEAR TOUCHED DOWN PRESS RETURNED TO ZERO. FOUND BY TAKING OFF CONNECTOR PLUG ON 73GG LT NEEDLE WOULD GO TO 3000 PSI. REMOVED AND REPLACED BRAKE YELLOW PRESSURE TRANSMITTER 73GG AND TRIPLE YELLOW SYSTEM IND. OPS AND LEAK CHECKED OK 1 GOOD LEG SO FAR.