What was found
LT REV UNLOCK CAUTION MSG ON THE THE CLIMBOUT. THRUST LEVER (L) OPERATED NORMALLY & NORMAL HANDLING OF ACFT. ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED AS A PRECAUTION. UPON INSPECTION OF LT ENG T/R SYS FOUND BALL SCREW ACTUATORS DRY. PERFORMED LUBRICATION OF BALL SCREW ACTUATORS DRY. PERFORMED SEVERAL OPS CHECKS OF LT ENG T/R WITH NO DEFECTS NOTED ALSO PUT ACFT IN WOW CONFIG WITH ENGINE RUNNING AND COULD NOT DUPLICATE ACFT OK FOR SERVICE AT THIS TIME.