My wife's bike is creaking while standing. I replaced the bottom bracket and lubed the crankset, pedals,.... Still creaking, so I am turning to the headset next. I haven't pulled it apart yet, but what I have read on the trek site it sounds like somewhere between a press-fit and the current integrated bearings (headset w/semi-cartridge bearings)

Any insight on are these serviceable bearings or just toss and replace? Anything I should know before pulling the fork?