Originally Posted by Red7

First off, the shop I bought it at is 2.5 hrs away and they are a really good shop so I'm not writing here because they won't help me. I'd rather first try to find and fix it myself in case it comes back again and if I can't, I'll make the trek down to the Trek dealer.

I got the bike a couple of weeks ago and the first ride I didn't notice the creak but I was mostly just riding around the neighborhood.

Symptoms:
-It creaks when I pedal and creaks when I don't pedal or put any weight on the pedals (does that rule out the bottom bracket?)
-It creaks when seated and it creaks when not seated (does that rule out seat post/rear isospeed?)
-It creaks when hands are on handlebars and creaks without hands (though slightly less but that could be because I'm riding more cautiously without hands).
-It still creaks when I manually stabilize the 2 water bottles/cages
-It still creaks when I hold the cables to make sure nothing is rubbing against the frame (though I did notice the ziptye holding the front brake cable on the fork and I haven't tried securing that cable)
-Manually flexing the seat, I can't get it to creak
-Manually flexing/twisting the handelbars, I can't get it to creak
-It sounds like it's coming from the front; steerer, fork, handlebars, stem, thru axle......
-I put fiber grip on the T nut that the screw goes into to secure the rear isospeed and that had no effect
-I put fiber grip on the stem cap where it mates to the tiny spacer above the stem and torqued it properly but that had no effect
-There is a proper 1/8"ish gap between top of steerer and top of stem so the cap isn't bottoming out
-I didn't remove the stem at all yet, just the cap so that's a possible culprit as it really sounds like it's somewhere in the steerer/head tube/stem area but I'm not sure what to do there so I didn't mess with it yet

I'm not sure if the shop put fiber grip between handelbar and stem or stem and steerer and I know they didn't put any between front hub and fork or rear hub and frame but didn't know if that's a good idea or not so I'm waiting to get some feedback here before I try anything else.

I'm open to any of your suggestions but I'd especially like to hear from anyone with an SLR to find out if you've had a similar creak and if you got rid of it. I love this bike but this is way too expensive of a bike to have my rides hindered by this annoying creak so I sure hope this just isn't something "normal". I'm sure it's not because the Domane 4.0 disc I had briefly before this one didn't creak at all.

Thanks for your help!