Cm2450 knock

[Khera]

Hey guys. I got a 2022 peterbilt 389. 350k miles. I bought the truck new. For the past 3 months I’ve been noticing a knock on cold starts. They kinda. Goes away when oil temp reaches no operating temperature. The knock seems to be coming from air compressor area front left of motor. FYI I do have upgraded high output air compressor. I got overhead ran last week as well. Didn’t make any difference. I ran injector performance test as well and all of em passed. Also did the fuel system leak down test and didn’t find anything? What are your guys thoughts on this?