What was found
VENT ABOVE MICROWAVE HAS A SMELL SIMILAR TO A CROSS BETWEEN DIRTY SOCKS & WARM ELECTRONICS. THE SMELL IS SIMILAR TO THAT OF A VENT ON A COMPUTER TOWER, THIS WAS NOTICED BY ENTIRE CREW ON THE GND WITH APU RUNNING. NO SMOKE NOTICED. NO SMOKE NOTICED. REMOVED APU INLET DUCT BOOT & PERFORMED VISUAL INSPECTION OF THE APU TURBINE SEAL USING A BORESCOPE, NO DEFECTS WERE FOUND & PICTURES WERE TAKEN & SENT TO MCC. INSTALLED APU INLET DUCT BOOT IAW AMM 49-15-05. REMOVED MICROWAVE & INSPECTED CABINET & MICROWAVE WITH NO DEFECTS OR UNUSUAL ODOR PRESENT. RAN APU FOR SEVERAL HOURS ON MULTIPLE OCCASIONS & HAVE NOT NOTICED ANY ABNORMAL SMELLS ONLY WARM ELECTRONICS, NO DEFECTS FOUND.