** It’s got 2 screws in the back and once they’re removed, the bottom lifts up from the back edge. However, the front edge does not pop up or out **
I’m not familiar with your exact model but most of the gas range oven bottoms I’ve seen lift up at the front while the rear stays in place (until totally removed).
If that’s the case with yours and you’re going at it from the wrong end, that may be the problem?
BTW. Was then technician you had out a Whirlpool *authorized service depot*? If not, they would likely be the best choice to call for service. If he was, you might try a Frigidaire *authorized service depot* if needed as your model looks like it *may* have been made for Whirlpool by them.
JMO
PS. If you get a chance, I would be interested in finding out its serial number.
Dan O.
http://www.Appliance411.com/?ref411=Whirlpool+range
The Appliance Information Site
=D~~~~~~