Get a clymers. If your not willing to spend money or time researching, go back to your plan of selling it. Trinity domes are usually cut wrong and cause very odd issues. South texas banshee has a harness. But if.your not willing to spend the money then that's on you. Ohm specs are in the clymers. A leaky seal will cause headaches. So yes a leakdown test is worth a lot. Think what you want, don't forget you came here asking for help. I gave you a pretty good list that takes people quite a while to even figure out to do. If your not wanting to do the leg work, then continue with your plan to sell it. Sent from my SM-G970U using Tapatalk