Powered tailgate help.
 

Hi-im somewhat a newbie here... Have a problem with my tailgate. I realize there arew numerous threads about this issue, but i am in need of direction and some pointers.. . Heres my issue- 09x5, tailgate wont completely unlatch. I can crawl into cargo area and pull the manual release, and the hatch completely raises on its own from here- it just seems to have an issue with not unlatching completely. I did some homework on this, and i was led to the lower tailgate mechanism. I disassembled the actuator in the lower tailgate, and applied some grease to moving parts, as it had only a trace amount of lube on these moving parts. This worked well for a week. Today when my wife tried to opem the tailgate so she could put some items in, and the same symptoms presented.. At this point, could someone please point me into a direction on where to look and start? Is there a relay to check? Fuses are fine. What else can i check?
Thank you all!!