As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT DIVERTED INTO LBB WITH CREW LP SUPPLY READING 0 PSI AND NO AIR FLOW TO ANY POSS ON FLT DECK. TROUBLE SHOT PROBLEM TO CREW LP FLOW VALVE. SWAPED FLOW VALVE FROM COURIER POSS TO CREW POSS. CREW LP SYSTEM NOW OPERATIONAL. NO LEAKS NOTED AT THIS TIME. WILL MEL COURIER LP OXY SYSTEM.