on my 99 Deville, the seat back will not move back or front..if I lean on it a bit much it will just flop down. The motor is happily working away, I can see under the bottom cushion and know a cable drive gear is broken..seems like an easy fix..if I can figure out how to get the bottom seat cushion off for access..any ideas on how this cushion comes off..HELP!..I don't want to bring this into the dealer..their cure for everything is $1,000....YIKES!