Hi, had to put both rear seats down the other day,and when it came to put back one of the seats will not go back in to the latch..... Not sure if its the latch that's gone. Have pushed the button ,to reset the catch...are these easy to replace...

They don't normally need replacing, just freeing off in my case. Take the top plastic trim off and if necessary the side trim and just clean it up and lube it.