Of all the upkeep a dishwasher of this age needs, the most valuable is the one almost nobody does: detaching the lower spray arm and flushing it through. The SHE7PT55UC, a stainless 15 place setting machine with a recessed handle, sat one tier beneath the 8 and 9 models of its family.
A decade or more of mineral-rich water, which is common across Greater Houston, furs up the channels inside the arm and partly closes its jets. The result feels like a lost-pressure problem, yet the pump is usually healthy.
Also worth knowing is that the rack tine coating tends to fail at this age. Chipped plastic exposes bare steel, which can mark crockery. The machine keeps a twist-out coarse and fine filter and an overflow float in the base pan.
Check the spray arms next. They detach for a flush, and at this age their inside passages are frequently narrowed by mineral build-up even though the outside seems spotless.
More likely it is the rack tines. Once their plastic coating chips, the steel underneath marks whatever touches it. Replacement tine sections and repair caps are available.
Look at them a couple of times a year in a hard-water home. If water jets are blocked, a soak and a flush with a thin probe usually restores the spray.
Book in about a minute, or call the desk. Same-day windows inside the Loop on most days, next-day across the rest of Houston.