What was found
ACFT EXPERIENCED HAZE AND FUMES IN THE CABIN DURING TOP OF DESCENT. MAINTENANCE OPERATED CABIN LIGHTING AND GALLEY ELECTRICAL POWER. NO TROUBLE FOUND. OPERATED BOTH PACKS WITH APU AIR AT HOT AND COLD. RAN ENGINES AT HIGH POWERSETTINGS WITH PACKS RUNNING. NO SMOKE NOTED. INSPECTED ACM INLETS AND OUTLETS FOR OIL CONTAMINATION. NONE FOUND. REPLACED COALESCER BAGS AND LEAK CHECKED OK. FOUND ELECTRICAL BURNING ODOR COMING FROM EPCU. REMOVED AND REPLACED EPCU.