The most common surprise on an older Burien door is finding the track bent enough that new rollers don't fix the noise - the roller was a symptom, not the whole problem, and a bent track needs replacing or careful straightening before the new rollers do their job. We also see hinges cracked from decades of a rough-running roller putting sideways stress on them, which is a separate part and a separate line on the quote. Climate here runs mild with the occasional freeze, so we don't see the rust-through failures you'd get in a harsher winter market, but condensation and age still corrode fasteners on original hardware, and stripped screws sometimes mean re-drilling a mounting point rather than a clean swap. One honest limitation: we don't stock every specialty roller size on the truck, and if your door uses an odd stem length from an older or imported model, that part may need to be ordered, which pushes the job to a second visit.