As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJU - FLT 633 - LEFT HYDRAULIC SYSTEM FLUID LOSS TO .33. FOUND B-NUT LOOSE ON HYDRAULIC RETURN LINE IN DOG HOUSE AREA FOR NR 1 ENGINE ACCOMPLISHED TORQUE ON B-NUT PER MM. REPLENISHED LEFT HYDRAULIC SYSTEM ACCOMPLISHED LEAK CHECK ON NR 1 ENGINE. NO LEAKS NOTED. OK FOR SERVICE. (M)