What was found
LOUD POP, BLEED 1 LEAK, APU BLEED LEAK, BAGGAGE SMOKE LIGHT AND PRESSED BAG EXT BUTTON, RETURN TO BLOCK. MAINTENANCE INSPECTED AND REPLACED BLEED DUCT SEALS AT NR 2 LOCATION, REPLACED THERMAL SWITCH, OPS AND LEAK CHECK GOOD, REPLACED BOTH BAGGAGE FIRE BOTTLES, OPS CHECK GOOD.