What was found
STRONG FUEL & EXHAUST ODOR COMING FROM BLEED AIR SYSTEM. STRONGER ODOR IN FLT DECK AND DURING FLT. THIS HAPPENS ON ENGINE AIR AS WELL AS ON APU AIR ONLY. FOUND THE MAIN FEED MANIFOLD CRACKED. FOUND BOTTOM B-NUT OF APU SOLENOID SHUTOFF VALVE LOOSE. SECURED THE B-NUT IAW AMM 49-31-05, LEAK AND OPS CHECKED GOOD. MAIN FEED MANIFOLD UNDER CARGO BAY FLOOR HAS A SPLIT AT THE FWD UPPER EDGE APPROX 10 INCHES LONG. REPLACED THE AC DISTRIBUTION MANIFOLD IAW AMM 21-22-01 LEAK AND OPS CHECKED GOOD.