Screen replacement
Often the panel only — not Apple's whole assembly.
Liquid doesn't kill a MacBook on the day. Corrosion does, over the following weeks — which is why a laptop that seemed fine after a spill dies a fortnight later.
This is the one repair where the clock genuinely matters. The sooner it's opened and cleaned, the more of it survives.
Rice does not pull liquid out from under components, and it does nothing whatsoever about corrosion — which is the thing actually destroying your laptop. All it does is delay the cleaning that would have helped.
If you've spilled something, don't turn it on, don't charge it, and bring it in. Today rather than next week.
That's the assumption that costs people their laptop. Corrosion is eating traces right now, quietly. Cleaning it this week is dramatically cheaper than the board repair you'll be paying for next month.
Most repairs have a price you can get online in seconds. This one doesn't, because nobody can tell you what a dead board needs without opening it — and a shop that quotes you a number over the phone is guessing.
So the diagnostic is $45, and it comes off the price of the repair if you approve it. If you decide not to go ahead, you've paid $45 for a real answer about your device instead of a guess.
Timing: most repairs leave the same day, port work included. Faults like this one are the exception — they have to be traced before they can be quoted, so it is usually one to three days.
Been near liquid at any point? Say so — it changes where we look first, and water-damage repair explains what that job involves.
Often the panel only — not Apple's whole assembly.
Including swollen cells lifting the trackpad.
Port, charging chip, or a fuse a bad charger blew.
Logic board repair, keeping your soldered storage.
Sticking keys, doubled letters, dead keys.