Hello. The leather of my 2 seater couch is damaged in one section. We tried an off the shelf tinted leather cream gel but this has yellowed. The couch seats are also soft and sag when guests are seated. I would like an 'invisible' repair to the colour of the couch and new foam and/or stapping to resolve the sagging. the suite has two matching recliners which are fine. Are you able to quote to repair? Thanks