I have an older japanese fender P-Bass lyte and recently it began cutting out (as if loosing battery life), and then eventually just stopped working. I have had 3 great guitar techs look at it, replace the battery terminals, clean the pots, and even check the pick-ups. My guess is that the pre-amp is fried. I would like to keep the bass all original, being it a rare breed, so where would I find the same pre-amp, or...how could I fix it? Any suggestions would be sweet.