What was found
THE CREW PERFORMED AN AIR TURN BACK DUE TO WINDSHEAR AND SUBSEQUENT DUAL ENGINE OVERSPEED. THE CAPTAIN FIREWALLED BOTH ENGINES AND BOTH WENT TO 2.2 EPR FOLLOWED BY COMPRESSOR STALLS AND AN ODOR IN THE CABIN. DURING INITIAL CLIMB-OUT CAPTAIN NOTICED AIRSPEED DECAY TO V2 +10 AND MENTIONED LOWERING NOSE TO GAIN AIRSPEED. AT APPROXIMATELY 1000 FEET AGL AIRSPEED DECAYED TO V2 AND CREW RECEIVED WINDSHEAR WARNING. THE NR 1 ENGINE N1 110 PERCENT EGT 680, THE NR 2 ENGINE N1 105 PERCENT EGT 645. REPLACED NR 1 ENGINE. REPLACED NR 2 ENGINE FAN.