What was found
BOI FLIGHT NR 2389, BURN ODOR IN CABIN ON TAXI OUT. RETURN TO GATE. MAINTENANCE REMOVED GALLEY OVERHEAD CEILING PANEL AND AFT CABIN O/H CEILING PANEL. REMOVED PSEU'S AT LT SIDE ROWS 17-19. ENGINE AND APU RUNS C/W. A/C ALSO TAXIED. INSPECTED WIRING, SWITCHES, PANELS, LIGHTING AND BALLAST. NO DEFECTS NOTED. INSPECTED AFT BATTERY PACKS. REMOVED MAPCOS, INSPECTED CONNECTORS. INSTALLED NEW MAPCOS. AIR COND PACKS RUN. HEATING AND COOLING CHECKED. ALL O/H PANELS AND PSEU PANELS REINSTALLED. ALL ELECTRICAL PANELS IN GALLEY CHECKED AND SECURED. NO EVIDENCE OF BURNING OF ELECTRICAL ODOR NOTED. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.