Zenith Z52SZ80 will shut down after being on for 15 minutes. We wait a few minutes and turn it back on. It shuts down again after less minutes. We repeat this and it keep shutting down. Lamp indicator is orange indicating the lamp is reaching the end of its life and needs to be replaced. Is it the lamp, only, that needs replacing or is the ballast also a problem? What are the part numbers for the lamp and ballast?
Thanks.

Televison & Video - Zenith - D52WLCD 52" Rear Projection HDTV-Ready Television