As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, SET 10TH STAGE VALVES PER SOP AND LEFT 10TH ARM OPEN APPEARED ON EICAS NR 2. FIRST OFFICER'S SYNOPTIC SHOWED LEFT 10TH VALVE WAS CLOSED, BUT LEFT 10TH SWITCH WAS PUSHED IN. RETURNED TO SLC. LANDED OVERWEIGHT BY 70 LBS. REPLACED LEFT 10TH STAGE SOV. OPS CHECK GOOD. COMPLIED WITH OVERWEIGHT INSPECTION. NO DEFECTS NOTED.