What was found
AIRCRAFT WAS NOT GROUNDED: DURING SCHED TIME CHANGE OF L4 SLIDE, WITH NEW SLIDE GIRT BAR DOES NOT RE-ENGAGE WITH TELESCOPING PIN ON FWD SIDE OF GIRT BAR FITTING WHEN DOOR IS ARMED AND DOOR HANDLE LIFTED AND ATTEMPTED TO CLOSE. MAINTENANCE REMOVED GIRT BAR PIN AND STRAPS, ADJUSTED GIRT BAR AND REINSTALLED GIRT BAR PIN AND STRAPS, RETIED KNOT, OPS CHECK GOOD. INSTALLED NEW SLIDE PER J/C #26L00025010.