What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO CLT DUE TO THE FLIGHT CREW REPORTING AN AIR R WING LEAK INDICATION - THE AIRCRAFT LANDED SAFELY AT CLT WITHOUT FURTHER INCIDENT MAINTENANCE TURNED ON APU BLEED AND HEARD HISSING NOISE COMING FROM TOP OF WING BEHIND R/H WING PYLON - MAINTENANCE OPENED PANEL 621BT AND FOUND V-BAND CLAMP LABELED CLAMP 11 IN AMM 36-11-48-400-004-A TO BE NOT PROPERLY TORQUED. RETORQUED CLAMP IAW AMM 36-11-48-400-004-A. LEAK CHECK GOOD. CLOSED PANEL 621BT IAW AMM 57-41-37. NO HISSING NOISE AFTER RETORQUE.