As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW EXPERIENCED A "HUNG START" ON NR 2 ENGINE AT 40 PERCENT NG DURING START. ENGINE WAS SHUTDOWN AND MX WAS NOTIFIED. REMOVED P3 FILTER HSG ASSY; CLEANED AIR FILTER HSG DRAIN VALVE. REINSTALLED P3 FILTER HSG IAW MM CHAPTER 73-10-07. PERFORMED OPS CHECK OF NR 2 ENGINE WITH NO DEFECTS NOTED. ACFT WAS THEN RETURNED TO SERVICE.