Need a little info please.

Have a Yaesu FT-990, no service manual. The light on the meter is dead.
Anyone ever change out one of these bulbs?
Is it a major undertaking or just minor surgery? Have changed a couple of
"grain of wheat" bulbs in dual band mobile radios before.
Just thought I would ask before tearing into the thing. If it is a real
major operation will send it off, other wise will dig in and do it myself.
Also, if someone has the service manual, perhaps you can pass along the part
number for the bulb, assuming it is a bulb and not a back lit meter of some
sort.

Sam - K7SAM