What was found
ELECT ODOR DURING CLIMB. AIR TURNBACK. DECLARED EMERG & DONNED O2 MASK. PERF AFOLTS TEST PER AMM 26-10-00. PERF ENG FIRE DETECT TEST PER AMM 26-11-00. PERF MAIN CARGO SMOKE DETECT TEST PER AMM 26-14-00. PERF LWR CARGO SMOKE DETECT TEST PER AMM 26-16-00. PERF APU FIRE DETECT TEST PER AMM 26-15-00. PERF SMOKE OR FUMES IN CABIN INSP PER AMM 05-51-56 & AMM 21-00-21. PERF LT & RT ENGINE IDLE RUNS IAW AMM 71-00-00. OPS PACKS, HYDS, FUEL PUMPS, ALL COCKPIT LIGHTS, CARGO HEAT. PERF DVI &THERMAL CHKS OF C/B PANELS, E&E SHELVES, E8 RACKS, LT & RT ENG CABLES, APU CABLES, COCKPIT OVERHEAD & INST PANELS, MAIN CARGO, FWD CARGO, AFT CARGO PER AMM 20-10-75 NO SMOKE, FUMES, CONTAMS, OR HOTSPOTS DETECTED. ACFT RTS.