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I had a Colnago CX-0 act up like that, turned out to be the seatpost needed greasing.
2nd on the insufficiently-tight rear QR.
I've gotten rid of a similar squeak/creak by tightening the pedal into the crankarm with the proper/full amount of torque.
Do you ever get the squeak while riding off the saddle? That eliminates the saddle and post right there.
Pedal-to-cleat and cleat-to-shoe are both common sources of squeak or creak.
I would say that stem and bar are less common to be a source of noise than on older bikes.
Some noises get diagnosed by swapping parts like wheels, pedals, shoes or saddle+post, which is simpler when you have more than one bike and pair of shoes.
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