What was found
DURING CRUSE FLIGHT L STRUT DUCT LEAK MSG IN-FLIGHT. DID NOT CLEAR AFTER PACK "OFF" & BLEEDS REMOVED, AC THEN DIVERTED TO CLT.BECAUSE OF ICE CONDITIONS AT CVG. AFTER LANDING MTX GROUNDED AC AND TROUBLESHOT TIGHTNED WIRES ON L STRUT TS236. RUNG WIRES PIN 1 & PIN 20 ON C/P D10224, READ 4¿. PERFORMED UPSTREAM LEAK CHECK FROM PRSOV, NO PNEUMATIC LEAKS NOTED. SWAPPED BLEED AIR CONTROL CARDS M859 & M860 FOR T/S. PERFORMED AIR/GROUND TEST. NO DEFECTS FOUND. SYSTEM OPS CHECK GOOD AT THIS TIME. WORK DONE IAW B767 AMM 26-18-00, 20-10-01, 36-11-09, AND B767 WDM 26-18-12. AIRCRAFT REMAINS NO ETOPS.AND RETURNED AC TO SERVICE .