There is a way to do it yourself, but with the sealed system it is a PITA. An immediate giveaway they didn't check manually is if they're done in just a few hours - because it needs to cool off completely before they even begin, like 4 hours just to sit, then do the check which might take an hour or so. Expect it to be there overnight or half the day at least. Because mine was low I wrote Toyota and got a 6 year 100k mile bumper to bumper warranty for free.
