If this is sitting on the ground, you need to raise it. Plywood that gets wet from ground contact will delaminate, pressure treated or not. Exposed wood needs to be sealed/painted on all surfaces (including end cuts). Tar will not help. Pictures may help you get advice as well.

Apologies for the delay, the upload had to be done off of my laptop. Mobile was taking too long. Naturally I would entirely agree that the shed should be lifted, though at the moment it is well beyond my capability at the moment. I may try in the coming years, but for the next 3-5 years, in honesty, I am just looking for a solution to stem or stop the rot.

I am aware of the dirt needing to be removed as well. There previously was an animal which clearly burrowed under the shed, hence the pile which enveloped the support beam in the corner. I plan on removing all of the dirt to allow for air flow.

Gotta' get that shed off the ground, Brendan.

Need to check all of the floor framing for rot...the usual way is to use the tip of a pocket knife and check for punky areas.

You just cannot expect wood to last when it is in contact with the ground. Pressure treated or not. The wood wicks up ground moisture and with no air circulation, the wood stays wet.

Entirely agree that is the end goal to truly fix the issue. It is just unfortunately out of scope at the moment. It's the unfortunate matter of trying to buy another 3-5 years before doing it all over again. Thankfully at the end of the day its the shed and not the actual house is the way I see it.

It's two dual sheds build together, at an angle so the slab of the deck hits the exterior wall, which is wood. The size of the sheds would be like rebuilding a quarter of the square footage of my home, electrical included. So such a project will need to be budgeted and planned far out. This is more of a sudden 'ahh crap' repair job.