This is my first post. I was changing the oil on my ttr230 and a small metal u-shaped plug came out with the large drain bolt,spring, and screen. I can not be sure if it came from there but it fell into the pan as soon as the oil started draining. I see a small hole in the top area of the drain screen compartment in the casting but am not sure if thats where this plug goes? I filled the bike with oil and started it and checked the bleed bolt for oil pressure and some oil came out when I removed the bolt? Anyone know what this plug might be?