Hi,
Could you please do me a favor and tell the indie mechanic to stop creating work to make money off from you? Obviously he tried to cheat you.
1) You never machine flush a Honda’s transmission and you only use Honda’s fluid for it.
2) If you are not losing fluid nor it’s leaking out of your engine, then you don’t have a leak.
3) Oil pan leaking, a few things you must check first: 1) clean the pan area so that you can see a leak if there’s one. 2) If your oil level is not low when you check then the leak is either not there or too little to be of concern. 3) How do you know it’s not the residual fluid left behind from oil changes?
4) Spark plugs: Stay with what the manufacturer recommended. However, I would pull it at 10,000 mile interval to see how’s the car doing. Only use the brand and model that is recommended under the hood.
5) Come here often or hond-tech to learn about your car more. You would be amaze how in heck I have been paying these mechanics all this money while I could do them myself.
Good luck and stay dirty.