Rick,
Have you checked how many hours your Mits. has on it? I have a WD-73734 but I believe this code may fit many models.
Press the menu button, then pres the numbers 2 4 7 0
The hours on your TV will show in the bottom left of screen (if it's like mine). This is not resetable. It is hours on the TV, not the current bulb. If you want to keep track of bulb #2's life, just log the hours into you manual or wherever.
I had 1,052 at the end of year one a few months ago. It was fun to find out the DLP had an odometer! From what I have read, I'm expecting 4 BILLION hours from my bulb!
(ok, maybe that's thousand 
)YMMV
