As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LT TENTH ARM OPEN MESSAGE APPEARED ON EICAS. THE LEFT TENTH SOV SWITCH WAS IN THE OPEN POSITION BUT VALVE WOULD NOT OPEN. PERFORMED SATISFACTORY OPERATIONAL TEST OF TENTH STAGE BLEED SYSTEM IAW CRJ AMM 36-11-00. NO FAULTS NOTED.