4300 sounds decent. Depending on how long it is, could be 7k almost.
Also, is there rot underneath?
When we do it, we pull off all trim, AC's, vents, etc. Clean anything worth cleaning. Replace cheap plastic vents, trim.
Strip off rubber. If the decking is no good, or rotted, replace it. If the OSB deck has chips sticking up, overlay it with luan decking for a smooth, non pokey surface. Otherwise, you'll have holes in your rubber. Glue the new rubber down.
Putty everything, reinstall, seal it all up, enjoy the 40+ of work you just did.