Can the backlight bulbs be replaced in xc90?

If this is a digital radio, the bulbs cannot be replaced. The radio itself must be replaced. You can attempt to remove the radio and see if there is a way to remove the bulbs, but I have found most of these cannot be user-serviced.

One of my backlight bulbs also burned out in my radio I brought it to the dealer and they replaced the bulb (bulbs) for free