What was found
AIRCRAFT LEFT KLBE WITH NORMAL TAKE OFF AND CLIMB, AT CRUISE THE ENGINE WENT INTO MANUAL MODE, CHECK LIST WERE FOLLOWED AND PILOTS RETURNED TO BLOCK AT KLBE AND LANDED WITHOUT INCIDENT. A DOWNLOAD WAS PERFORMED ON THE DEECS AND THEY WERE SENT TO ENGINE AOG SERVICES, TROUBLESHOOTING DETERMINED THAT THE FAULT WAS THE TT2 SENSOR, THE SENSOR, WIRING, CONNECTORS AND DEEC ALL CHECKED GOOD, TT2 SENSOR WAS SWAPPED WITH OPPOSITE ENGINE, ENGINE RUNS WERE PERFORMED WITH NO FAILURES, MANUFACTURER RECOMMENDED TO RETURN TO SERVICE AND MONITOR. A TEST FLIGHT WAS PERFORMED WITH NO DISCREPANCIES AND WILL MONITOR. AIRCRAFT WAS RETURNED TO SERVICE.