1997 1/2 ton Silverado 350 Ext Cab Auto

This truck has a mysterious short, it began about two months ago. The short will drain the battery within 1-2 days. A local shop is having issues finding the short, they have checked the battery, there is no Engine light coming on, the alternator works fine, and there is no draw when it's first turned off.

Oddly, and probably a coincidence, but the first time this happened was after another shop did some checking of the air bag system (the Airbag light was coming on).

Are there any known (mysterious) electrical issues with this model year?

Any suggestions will be appreciated.

Tom Finlay