What was found
FLIGHT 7777 RETURN TO BLOCK, WO 208-157019 DISCREPANCY. ON TAXI OUT LT BRAKE INOPERATIVE. INSPECTED BRAKE SYS, FOUND LT BRAKE CALIPER SEEPING, CHECKED LT MASTER CYLINDER & LINES. SUSPECT LT HARD LINE FROM PARKING BRAKE, VLV ALSO SEEPING, ALL OTHER LT SYS COMPONENTS CHECKED GOOD. RT CALIPER, MASTER CYLINDER & RT BRAKE LINES CHECKED GOOD. REMOVED LT CALIPER, CLEANED & INSPECTED ALL PARTS. REASSEMBLED WITH ALL NEW O RINGS. INSTALLED ON ACFT WITH NEW BRAKE LININGS, INSTALLED NEW HARDLINE FROM BRAKE VLV AFT BLED SYS & CHECKED FOR FURTHER LEAKAGE WITH NONE FOUND AT THIS TIME. PERFORMED NEW BRAKE BURN IN. BRAKE SYS CHECKED GOOD. ACCOMPLISHED IAW MM 32-40-00.