As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW O2 BOTTLE MAY HAVE LEAK IN THE SYS SOMEWHERE. STARTED DAY WITH 1500 PSI & DOWN TO 1300 ON ARRIVAL. NR O2 WAS USED AFTER THE INITIAL TEST & FOUND O2 LEAK AT OBSERVERS O2 LINE FITTING. REPLACED FITTING IAW AMM 20-12-03. REMOVED CREW O2 BOTTLE, SERVICED & REINSTALLED IAW AMM 25-10-01 & GMM 21-11-5-2, NO LEAKS NOTED.