Ok, I had the class last night. There were 3 students. We spent about 3-4 hours in total. He started with a shop overview. After that, he pulled out some lights and had us lubricate the o-rings. Then we took apart our BCDs. Cleaned the bladders. Reviewed the parts in the dump valves and took apart the inflator. Showed us places where the salt builds up from salt water diving. Next it was onto our Regulators. Took them apart to show us both the first stage and second stage and had us all read our Intermediate pressures, and how to adjust that. Then went on to dismantling the second stage, showing us how that worked and how to clean those parts. Then we put my reg up on the bench, and tested it at depth, so you can adjust the diaphram and show how the resistance goes down as the pressure increased. Took off the mouthpiece and bolted it back on. Checked the pressure which then let me check my SPG and my AI computer. Next we took apart our computers to show us how to change the batteries. We then tested the computers in a pressure tank. Finally it was tanks and he showed us how he does a Vis and explained the process of a hydro, as they don`t do those on site. It was a good class, as I learned what is fairly easy to maintain, and what I will have they do when it comes to servicing my equipment. It was worthwhile just to check out my gear. The maintenance we did alone would have cost me as much as the class did at the LDS, and this way I was able to see how its done.