the front door lock, i've taken it apart and used powdered graphite lube on it several times to keep it limping along, but if we used that door a lot it would need to be redone entirely. it fits too tight and i made it much worse by weather stripping the whole thing. at present i only consider it an emergency exit. we never really use it anyways. the garage entrance is used all the time or once in a while one of the patio doors (there's no porches, decks or patios outside of them, just some very narrow rock stairs and in the one case the ex-step-dad put them in the wrong place so you don't even have that...).
some year i'll just redo them all if they get to be too bad and i actually have to use them.