What was found
DISCREPANCY: REFERENCE LP1185665-1. PERFORMED AIR TURN BACK IN KLAS ON TAKE OFF, FIRST OFFICER REPORTED LOUD ELECTRONIC NOISE IN HEADSET, AFTER ROTATION THE #2 ACP LIGHTS ALL ILLUMINATED AND CREW SMELLED A STRONG ELECTRONIC BURNING SMELL. CREW COMPLIED WITH SMOKE IN CABIN/COCKPIT MEMORY ITEMS AND RETURNED TO KLAS. CORRECTIVE ACTION: PERFORMED INSPECTION PER TSM 05-50-000-810-831-A. DETERMINED THAT #2 ACP WAS THE SOURCE OF THE ELECTRICAL SMELL. R&R'D #2 ACP S/N# 984 OPS CHECK NOT GOOD. COULD NOT SELECT TRANSMIT FOR VHF.ITEM#3 REMOVED AND REPLACED #2 POS ACP IAW AMM 25-50-00 PB401. OPS CHECK GOOD NO FAULTS FOUND. ACP S/N 984 FOUND TO BE DEFECTIVE./END/