one lifter bleeds down. Any thoughts

Thanks Bobby and Dave. I figured as much (take it back apart) but was hoping someone would know some miracle solution. I'll pull it down and see what it looks like. Hopefully just some piece of crud in it. If not the problem with the warranty is I bought it nearly a year ago and their warranty is only 3 mths. I guess that'll teach me to buy parts way early.

Dave their Comp Cams lifters. A buddy of mine has a 454 Chevy with a 268XE cam and also has the same problem you described your has but his are Comp lifters.