What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO LAX DUE TO THE FLIGHT CREW REPORTING THAT DURING CLIMB THERE WAS AN ELECTRICAL SMELL / PLASTIC BURNING SMELL WITH NO SMOKE VISIBLE BUT FLIGHT ATTENDANTS IN THE BACK CONFIRMED THE ODOR/FUME, AS WELL. THE AIRCRAFT LANDED SAFELY AT LAX AND THE FLIGHT CREW REPORTED THAT ON LANDING, ARFF DETECTED CONTINUED SMOKE EMANATING FROM THE AFT OF THE #1 ENGINE FOR ABOUT 15-20 MINUTES AFTER ENGINE SHUTDOWN. USED APU AIR ON THE GROUND AND THAT AIR SEEMS FINE. (OPEN)