As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DE-ICE BOOTS (LEADING EDGES) AND LEFT ENGINE AIR INLET WOULD NOT INFLATE. FAILED ALL DE-ICE TESTS ON TIMER 1 HEAVY CYCLE AND (L) INBOARD AND (L) OUTBOARD BOOTS FAILED ON TIMER 2 (ANY CYCLE). RETURNED TO LAX. LUBED EJECTOR VALVES AND RAN ENGINES. DE-ICE OPS CHECKS GOOD.