What was found
AFTER T/O ON INIT CLMB, BOTH HYD SYS B PUMPS LOW PRESS LIGHTS ILLUM. HYD QTY IN A SYS DROPPED TO 2.5 GALS, B QTY APPEARED NORMAL. PRESS THEN DROPPED TO NEAR ZERO, TURNED PUMPS OFF IAW POM 1 TO 2 MINS AFTER ILLUMINATION. FOUND O-RING ON NR 1 B SYS HYD PUMP CASE TO END PLATE BLOWN OUT. REPLACED BOTH CASE DRAIN FILTERS CHGD, NO CONTAMINATION. REPLACED NR 1 B SYS HYD PUMP, SERVICED SYSTEM. OPS CHECKS AND LEAK CHECKS GOOD.