Visited the dealer and after removing the headlight, Bob (head ML tech) determined that the shaft from the leveling motor had popped loose from the lamp assembly.

We learned a couple of things about the headlamp unit:

1. The halogen lamp and the bi-xenon lamp are tied together into one unit, so the leveling motor affects both lamps aim.

2. The internal lamp units are spring loaded so if the leveling motor shaft is disconnected the unit will aim itself toward the sky. That was the cause of the problem and why I was out of adjusting range.

3. The H7 bulb does not appear to be a standard replaceable bulb, but some proprietary assembly which uses a H7 bulb. I was going to pop my old Vision Plus H7's into the assembly, but after removing the wiring harness, saw that it looks like a different beast inside and left it alone. If anybody wants to dig inside and confirm this, you're on your own.

Comments from the tech and service writers about putting a 2002 bi-xenon unit into an 01 was . . . cool!