What was found
DURING CLIMB, ACFT CABIN ACT WAS TOO HIGH. FOUND PACK VALVE C/B POPPED. CABIN ALT STABILIZED AT 8500' AT 20,000 WITH L AFT PACK OPERATING ONLY. TROUBLESHOT SYS, FOUND PACK VALVE BREAKER WOULD RESET MOMENTARILY. CHECKED BOTH FWD PACK SHUTOFF VALVES NO DEFECTS NOTED. FOUND RT PACK FLOW CONTROL VALVE CONNECTOR D870 HAD WIRES W338-010-20 AND W338-105-20 SHORTED TOGETHER CAUSING C/B TO POP. REPAIRED AND REPINNED WIRES AS REQUIRED. INSTALLED CONNECTOR RESET C/B AND PERFORMED OPS CHECK OF BOTH PACK SYS WITH NO DEFECTS NOTED. REF MM. 36-12-061-4 / MM. 21-55-000-5. ACFT OK FOR SERVICE.