That certainly doesn't sound normal for the Abraxas. Those Bernies are fairly warm in my experience, but not to the extent that you're describing, certainly.
Are you noticing this to be the case for both pickups in the set, or one in particular?
I would suspect that you have had either a connection in there somewhere go bad while stored, or may have a short circuit that's affecting the correct operation of the controls. Have you tried out the tone control on the guitar to ensure that it's giving the expected range of variation in the sound of the guitar?
One good option is to connect the bridge pickup directly to the jack socket, therefore bypassing the other components in the guitar and giving you a true sense of what the pickup is outputting.