Hi Dave,
Here's the details from the build record:
98W11517 WLB5 Epic bass
top: Flame Walnut
accent: Maple pinstripe
body: Mahogany
neck: 5-piece Maple with Walnut pinstripes, 34 long scale
fingerboard: Ebony
pickups: 2 Alembic MXY
controls: Epic volume, pan, bass, treble, mono output (obviously changed!)
birthday: May 8, 1998
originally made for: Global (Italy)
From the picture, it looks like the bass and treble controls were replaced with a filter and Q-switch kit. If you post a picture of the electronics cavity, I can confirm.