Is the tub (lower body) on a 2007 Max IV polyethylene? I have plenty of that. I found 2 holes in my tub, one where at one time, the tracks came off and ate a hole in the tub. Somebody tried to fix it but failed, then when I steamed the tub out today, I saw daylight through a dime size hole in the bottom. Guess I'll do a little plastic welding. I think I read somewhere that the tub material was polyethylene. Any body help me here?