[Shotimes] ATX Park release button wont release

[Jef & Laura Denning]

Suddenly, the release button on my ATX shifter won't release and I'm
stuck in park:  the button does not go all the way in.  So far I've been
able to fool with it (a lot) and get it released.  (Here's one for the
Karma book, it happened the first time on the day I decided to sell the
car -- after 108K miles!).  I've had trouble searching the archives, but
did find a post on removing the shifter knob.  Is that likely the fix?
Is it possible that the problem is a loose connection etc. under the
console? 

TIA

93 ATX, 108k mi (basically original owner).  

(Sorry if this gets posted twice,  the first time I sent it I was
registered but not subscribed.)