What was found
CLIMBING THROUGH 14,000, NOTICED A BURNING ODOR AND OBSERVED HAZE IN COCKPIT. DECLARED EMERGENCY AND RETURNED TO DEPARTURE. CHECKED FLIGHT DECK, MAIN CARGO DECK, FWD & AFT LWR CARGO COMPT BULK CARGO AREA, ACM AREAS, MAIN EQUIPMENT CENTER & GALLEY AREA FOR OBVIOUS DEFECTS. NONE FOUND. RAN BOTH ENGINES AND APU FOR 15 MINS IAW AMM 71-00-00-201. TESTED SMOKE DETECTOR SYS. OPS NORMAL. NO BURNING ODOR OR SMOKE ALARM DURING ATB EVENT. OK FOR SERVICE.