As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 0120Z "HYD B RSVR LO LVL" ILLUMINATED. AFTER CONSULTING WITH MX, DETERMINED LEAK AND NOT TRANSMITTER. RETURNED TO DEPARTURE. R & R NR 1 ENGINE BLUE SYS ENGINE MOUNTED HYD PULSATION DAMPENER IAW AMM 29-12-54. OPS AND LEAK CHECK GOOD.