Neither lamp will turn on, and both lamp status lights blink three times. I had just replaced both lamps a couple days before, but putting the old lamps back in doesn't fix it.
The "find a repair center" link on the Panasonic site is conveniently 404.
Update: The only local-ish place I found that repairs these is Media Associates in Mountain View.
I recently had issues with my PT-AX100U, from this I learned that the one authorized repair shop in the Bay Area (at least on the Panasonic web site) was these guys: Media Associates.
They were conveniently close to my office, but wanted over a hundred bucks just to look at it. However, the issue I had was so widespread that it turned out there was a Youtube video demonstrating how to fix it, so I don't actually have any opinioin on their level of service.