What are the likely issues I need to check out first?

What is your question?

Passenger elec. sliding door doesn't close all the way on its own. If you manually assist with pressure (closing direction), it will close otherwise it opens up all the way. The rubber and paint on the lower side of the track groove appears to be a bit worn/ cracking. The door gets to where it starts going "into" (at the turn) the car when it stalls and opens. Also seems as though the door raises or jumps up to get in line with door open to latch closed. The jump is minimal, but not a smooth parallel run from open to close. Thanks for your assistance.