As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER RT ENGINE START, THE RT BLEED LIGHT AND RT ENGINE PRV EICAS CAME ON. CREW STATED AFTER RIGHT ENGINE START THE RIGHT BLEED LIGHT TURNED ON AND ASSOCIATED HPSOV EICAS MESSAGE. BLEED AIR PRESSURE WAS NORMAL. NO FAULTS NOTED ON AIR SUPPLY BITE MODULE. FOUND LOOSE B-NUT ON SUPPLY AIR LINE TO PRVC. TIGHTENED NUT. NO LEAKS NOTED. PERFORMED HEALTH CHECK PER MM. ALL VALVES OPERATE OKAY.