Before my “accident” in last Sunday’s OLY, the vision bars (base & clip-ons) on my P3SL were as quiet as you could wish for. However, after nearly going arse over tea-kettle–thankfully that pricker bush was there to sop me :o --they are squeaking like all hell. I checked all the bolts and they are good and tight and they don’t seem to be cracked.
douse your bike heavily with WD-40 or GT-85 or similar and pay particular attention to the troubled areas, clean it up and if it creaks again then take it to your bike shop and have it inspected for cracks.
Well, I can’t believe I missed this but there is a bolt on the adjustable stem the guy that did my fit (Paul Fabish) put on–just until I can get my flexibility to the point where I can stay aero with my old stem–that I didn’t tighten. I mean, I hit every other bolt on the front end sans that friggin’ one. What an IDIOT! In any event, he got a couple turns out of it–it must have loosened up when I did the wheel-stand at Cranberry–and that fixed the squeaking!