Battery problems of the 2002 Mazda Tribute

Mazda Tribute died on a busy road during a rainstorm, would not crank, windows and gauges on dash intermittently worked as we waited for a tow -- towed to a shop,engine still won't crank. The local repair shop tech believes it is TSB: 01-047/06. Looking like a $1,200 bill coming (pcm, labor to troubleshoot and repair. . . And a new battery). . Went to Mazda and they say the TSB helps a tech troubleshoot a problem. . My question is that if Mazda has had enough of these issues to write up a TSB then it must be a widespread issue caused by a Mazda design defect, so why is Mazda not backing it up and fixing for free as a recall or reimbursing if the fix is performed by an independent repair shop? (the part alone is ~$700)? need vehicle so having it fixed and will ask for the replaced part (powertrain control module - pcm).

While driving 45 mph battery light and oil light illuminated on dashboard, resulting in engine to stalling.