If im not mistaken, you can call the shop and get the spring loaded detents. I prefer them over the spyder type.
You dont need spare orings. The only moving orings are the two rammer orings. one on the ram and the other that the ram slides through. size 11 on the rammer and i think size 012 that the ram slides through.
My rammer oring is from 09 (if im not mistaken) and its very broken in, slides EASY yet it still seals. Aliens dont chew through orings, the rammer is sealed.
The board screen can be replaced through tadao. I have the same board in my marq, the screen is really bright, its worth replacing.
Call Jack to get any info you need - 530 344 1155
fiy, your gun is very low maintenance. I would go through the regs and re grease them. Grease the rammer as well. might not hurt to clean the cup seal and poppet. Once you do all that, you wont have to touch anything for a long time. I clean my regs once or twice a season. The rammer should only be greased every once and a while as well.. even then its overkill. Clean the bolt, eyes, detents after you play.. thats it
Like Jack says, messing with things tends to ruin things more than just letting them be.
I hope the guns serves you as well as mine has, mine is irreplaceable. I love it that much.