As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STARTING ENG #1 N2 STUCK @ 22%, N1 > 3.4 ENGINE STARTED NORMAL. FA IN AFT THOUGHT SHE HEARD A SMALL BANG. GROUNDED - YES. PREFORMED 3 ENGINE STARTS #1 ENGINE. MECHANIC IN BACK HEARD NO BANGS DURING START. ENGINE PARAMETERS AT START ALL NORMAL.