up date on ct 525

Up date on Ct 525 . We took engine apart and found that #7 connecting rod bolt was not tightened torqued. Now that we know what happened maybe Chevy will look at engine. If anybody knows somebody at Chevy that might be able to help us. Right now Chevy doesn't. Want to do anything about engine. They are still stating that we did something wrong. Funny thing we didn't build it. Any help would be welcomed. Thanks