What was found
LT HYD PRESSURE LOW LIGHT ILLUMINATED, INDICATING HYD PRESSURE BELOW 1400 PSI AT LT ENG DRIVEN HYD PUMP, SYS PRESSURE REMAINED NORMAL AT 2000 PSI, AS CREW MONITORED SYS PRESSURE THE RT HYDR PRESSURE LOW LIGHT ILLUMINATED, CREW AT THIS POINT DIVERTED TO MSP FOR RUNWAY LENGTH REQUIREMENTS. ACFT LANDED WITHOUT INCIDENT AT MSP. UPON INSP, THE MAIN HYD SYS FILTERS WERE LEAKING AND DETERMINED TO HAVE FAILED O-RINGS. O-RINGS WERE REPLACED, HYD SYS SERVICED AND PERFORMED LEAK CHECK AND LANDING GEAR FUNCTIONAL TEST IAW MM 32-30-00. ACFT RETURNED TO SERVICE.