Need 3.5 Acura Expert Asap!!!!!!!

[DOOM]

I have a Acura TL TypeS in my shop . The car currently has 103000 miles on it. On cold starts the engine sounds fine. After about a minute it begins to make a knocking/ticking noise that last for about two minutes then goes away. I don't know if this is a common problem with these engines or if its a maintenance issue. Looking for some ideas for what to look for.