Introduction
This article was originally by Misteroboto, if you have any questions about this procedure please post a follow up to the forum thread here.
Parts
7225 bulbs

Open the door behind the lens cover.

Move the wire harness out of it's holder. You'll probably need the space to
pull the bulb carrier out of the way.

The black piece is the carrier for the bulbs. Disconnect the three plugs from
it. The top two have tabs that you squeeze to release them. My hand wouldn't fit
too well on the lower one so I GENTLY pried them one at a time to ease the plug
off.
The gray plastic piece holds the turn signal bulb. Turn it counterclockwise 1/4
turn to release it.
There are two tabs that hold the carrier in place. Push them inwards and the
assembly should come out easily.

Turn the bulbs counterclockwise 1/4 turn to release the bulbs. The carrier
has two j shaped hooks in it. Line up the posts on the new bulb, push and turn.

Push the bulb carrier back in place.
Line up the gray piece with the hole. The two metal prongs on it should be on
the lower side. Twist clockwise.

Plug the wires back in and test it out. Put the wire harness for the amp back in it's strap and put the door back on and you are done. Easy peasy.
Want to find more DIY maintenance? Search below or up a page to the "how to" index.