NEED HELP WITH FLOOR DRAIN REPAIR!

[Blue197320]

i finally think i isolated the leak into my bilge. it seems to be coming from the port side floor drain. so i want to replace both sides. i need as much detail and information available on how to do this. or if anyone in kendall area wants to get a little extra cash on the side and help me with it thats welcomed also. i dont wanna take my boat out again until i get it straightened out. please help if u can. my seacraft surely will appreciate it!
thanks
evan