What was found
LOSS OF HYDRAULIC SYSTEM B PRESSURE AND QUANTITY IN FLIGHT. FOUND B SYS QTY AT ZERO. FOUND LEAK AT B SYS HYD MODULE PLUG. REPLACED PLUG ORING RETORQUED AND SAFTEID. WILL NEED LEAK CHECK WHEN HYDRAULICS ARE RESTORED. FOUND "B" SYSTEM HYDRAULIC RESERVOIR AT 0% QTY. DUE TO UNKNOWN TIME ENGINE & ELEC HYD PUMPS WERE RUN WITH ZERO QTY NEED TO REPLACE #2 EDP AND B SYS EDMP. ALSO RPL B SYS CASE DRAIN, PRESSURE AND RETURN FILTERS. CHECKED SDR DUE TO LOSS OF ALL SYSTEM B HYD FLUID. CREW SHUT DOWN BOTH SYSTEM B HYD PUMPS IN FLIGHT. SYSTEM OPS HAS BEEN RESTORED TO NORMAL. ORIGIN OF ORIGINAL LEAK WAS AN ORING ON A PLUG AT THE B SYS PRESSURE MODULE. LEAK AND FLIGHT CONTROL OPERATIONAL CHECKS NORMAL.