What was found
LT BLD DUCT LEAK(ON GND APU PWR & AIR).(<P>FOUND COUPLING TO ACM LOOSE, ADJUSTED SAME PER AMM 21-51-00, LEAK CKS GOOD.</P> / <P>16JUL21 - 1476169 - ITEM# 3 - BWI - ADJUSTED LOWER REAR COUPLING TO ACM PER 767 AMM 21-51-00. LEAK CHECK GOOD AT THIS TIME. NO MSGS. DUCT PRESSURE RISE IS OK.</P>)