Ford ranger tailgate

my 2001 ford ranger flairside pick-em-up truck has a faulty handle. i cannot lower the tailgate. after buying the truck used, i found the tailgate did not work. i had the mechanism replaced, it worked for about two days, then failed. the mechanic readjusted it, it worked for a few days, then died again. any thoughts?

Here is a link that show the tailgate mechanism. The handle is attached to two rods that are connected to latches on the side of the tailgate. Perhaps one of the rods detached.

http://www.autozone.com/az/cds/en_us/0900823d/80/0b/ea/3c/0900823d800bea3c/repairInfoPages.htm