Hmmm? I was thinking of pushing water up from the block drain and see if anything comes out from the opposite direction.
You could use a wet/dry vac and suction out from the wp hole.
Have you tried 'sort of' reassembling the broken pieces to get a sense of how much you're missing?
Upcoming comedy shows: March 3 at Broadway Comedy Club, NYC, 8 p.m. March 5, Tierney's Tavern, Montclair, NJ, 7:30 p.m. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!