the release for the lap part of the restraint on my Grayco car seat has always been difficult to open. but yesterday I was unable to open it at all, and one of two samaritans I collared was finally able to release my granddaughter. I'm afraid to use the seat. can the harness and buckle be replacd?? The number on the seat is LAPCO111A. Thank you for your advice. Lindsay Holmes. Email lak6863@hotmail.com