Highway robbery actually probably fine!Typical OSA thread. Starts off about one thing and then like an old man's memory starts to wonder all over the place.
Short version, turned out not to be a leak but condensation in the plenum along with a few tears in the ducts. They wanted way to much so it is going to have to wait until next year. $700 just clean the plenum and install a UAV light. $1500 to clean the plenum and repair the ducts, $4000 to replace the plenum and repair the ducts.
Sadly my health and size (along with my wife and doctor) prevent me from getting in the attic to repair the ducts, which only seem to be torn on the outside.