Andrew R Stewart 

So we start with the easy stuff first. Items that only need simple tools and time. Cleaning and lubing the seat and post interfacing surfaces and hardware. next might be the bars and stem (mainly because it's a good idea and easily done, not that I think this is the source of noise). The next place is typically the pedals then crank/BB. It's very common for AL framed bikes to have the BB settle in the BB shell and need some service after initial use (as most factories don't apply much or any lube between the BB unit and the shell and the BB shell being AL will slightly be molded by the usually steel BB unit and need at least retightening). Andy.