US Airways A321 near Phoenix on Oct 3rd 2014,

A US Airways Airbus A321-200, registration N172US performing flight US-796 from Los Angeles,CA to Philadelphia,PA (USA) with 142 passengers and 6 crew, was climbing out of Los Angeles when the crew requested to stop the climb at FL190 indicating they might need to return to Los Angeles due to a problem. The aircraft subsequently climbed to FL250 and diverted to Phoenix,AZ (USA) where the aircraft landed safely about 100 minutes later.

The airline reported an engine (CFM56) indication.