Ok, so I changed the transmission fluid in my JD 316 Kohler. Replaced the proper JD oil filter, hooked up bottom cooling pipe as it should be and capped the transmission fill port. I have a nut and lock washer left over and I can't figure out where they came from. Looks to be about 3/8". Nothing is leaking as far as I can tell. It's stopped raining so I'm going to look under the tractor again. Any thoughts?