GMC Canyon leak / Replacement turn signal bulbs

A week ago I had the oil changed in my '05 GMC Canyon. For those interested, the engine is a 2.8-liter four-cylinder motor. After the oil change was finished, the mechanic who did the job said that there was an ever-so-minor trickle of fluid on the front axle. We're talking so minor it's almost not noticable. It appeared to be coming from a seal near the front transfer case (the truck is a 4x4 by the way).

So I took it to the local Chevrolet dealership and had them put it up on the lift. The seal in the front has a teeny-tiny leak, as in a barely-there leak.

My options were to do the following:

Keep on driving it the way it is as it has absolutely no impact concerning normal driving conditions.
Have the fluid drained, re-filled and seal replaced ($350)
Have the fluid drained and re-filled with an additive that would "fatten up" the seal ($150).

I opted to go with a for the time being. I can basically drive it until it either develops into a major leak, or
just pony up the $350 for the seal replacement later.

In other words, it's not a big deal.

The truck at this point just has over 53,000 miles on it and this is the first "major" thing that's happened to her. And to be honest it's not major at all.

She's been a really good runner and the gas mileage is outstanding. On average I get 27mpg on the highway - and considering this truck is an extended cab (more weight), has a heavy automatic transmission (even more weight), and is lugging around a 4x4 transfer case in the front (add that too), that's definitely worth bragging about. You'd be lucky to break 20mpg on similarly equipped light trucks, but the Canyon gets 26 to 27mpg on the
highway easily when the bed's empty.

. . .

Also forgot to mention: The driver's side turn signal light finally blew about 1,000 miles ago, so I decided to replace all four.

A few notes on turn signal lamps in the Canyon/Colorado:

It is, by far, the easiest light replacement I've ever done. Open the hood, twist, and they pop right out. Pull on the bulb and out it comes. It doesn't get any easier.

The lights that actually flash are different from the ones that don't. The inside lamps have gray-colored bases while the blinkers have black-colored ones. And yes, the mounts are different. You can't put the grays where the blacks should go. Fortunately, Autozone has both in stock and they come in sets of two, so as long as you're aware
that the bases are different, the replacements are easy.