What was found
HYD SYSTEM NR 3 OFF. QTY 10.1 CONFIGURED HYD SYS 3 PRESSURIZED OK WITH NO LEAKS DETECTED. HOWVEVER RECEIVED RMP 2-3 DISAGREE ALERT. HYD 3 QUANTITY WAS AT PROPER SERVICE OF 7.5 WHEN ACFT BLOCKED IN. ON THE HYDRALUIC SYNOPTIC PAGE THE CYAN PREDEPARTURE QUANTITY LINE MATCHED THE BLOCK IN QUANTITY. BLED AIR FROM NR 3 RESERVOIR. FOUND THE HSC WAS INTERMITTENTLY NOT ALLOWING YOU TO MANUALLY TURN OFF THE NR 3 PUMPS THROUGH CFDS. REMOVED AND REPLACED THE HSC. WHEN HSC WAS REMOVED, FOUND GREASE FILM ON HSC RACK CONNECTOR. CLEANED RACK CONNECTOR. PERORMED OPERATIONAL CHECKS OR HSC. ALL TESTS PASSED