Still confused here. You say in your first post that the dealer told you there was an internal leak but somehow Pep Boys is now involved? Did you take it there for a second opinion? If so, it is always a good idea to get a second opinion, but I would recommend getting it from a certified mechanic, not a parts salesman. But at least the dye will tell you if combustion gasses are getting into the coolant.
If you are not losing enough coolant to be noticeable, but it fails the dye test, go to the Subaru dealer and get a bottle of coolant system conditioner. It will stop very small leaks and is safe for your cooling system. This is not a "head gasket repair" in a bottle which will ruin your cooling system and engine.
But at 92k miles and 11 years, you are due for a coolant service so do that first. All you need is a drain and refill with Subaru coolant. Do not allow the dealer or shop to do a flush of the system, that often does more harm than good, depending on how it is done. A coolant exchange type of flush at the dealer generally is safe but unnecessary. Other types of flushes are not safe or effective.
At the drain and fill, add the conditioner.
If you start losing a lot of coolant, like say a quart a week, overheat or have other issues and a diagnostics is done by a mechanic determines that you do need head gaskets, then get a quote from the dealer. They do quite a few of these on older Subarus so know how to do it right. Often their price is very competitive with local independents, but do get more than one quote. Also get recommendations on any independent and make sure they have a good reputation and have experience with Subarus. I'm just saying don't automatically rule out the dealer just because someone else you don't even know says they will be way overpriced because it ain't always so. Just do good business here as car repair is a business transaction and you don't need to be an expert on cars, just follow good business practices.
