The HVAC guy who screwed me (edit: i do believe he tried to find a leak the first visit, but the second visit he didn't seem to be bothered) on a refrigerant refill (see my other posts) is recommending I switch out the whole AC system because it's 17 years old.
My wallet would rather pay $150 to find the leak, then just replace the leaky component.
Is it a bad idea to replace just the leak?