A CRJ-700 ACFT WAS FOUND TO HAVE ELEVATORS JAMMING UP DURING PREFLIGHT AFTER MAINT REPLACED ELEVATOR LEVERS.

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DURING ACCOMPLISHMENT OF ENGINEERING ORDER; RODS WERE INSTALLED INCORRECTLY. TECHNICIANS AND INSPECTOR WERE TASKED WITH ACCOMPLISHING ENGINEERING ORDER; SVC BULLETIN; REPLACEMENT OF ELEVATOR LEVERS. BEFORE STARTING WORK ON ACFT; TECHNICIANS PERFORMED AN ELEVATOR MOVEMENT CHK TO VERIFY FULL UP AND DOWN TRAVEL ON COCKPIT STATUS SCREEN INDICATOR; AND RECORD DEGREES OF MOVEMENT. INDICATIONS WERE CORRECT. ACFT HAD PANELS REMOVED WITH 1 TECHNICIAN ON R-HAND SIDE OF VERT STABILIZER IN SCISSOR STYLE MANLIFT; AND ANOTHER ON THE L-HAND SIDE IN BUCKET STYLE MANLIFT. BEFORE ELEVATOR SYS WORK WAS STARTED; RIG PINS P1; P2; P3; AND P4 WERE INSTALLED TO CHK FOR FREEDOM OF MOVEMENT. REPLACEMENT OF ELEVATOR LEVERS WAS ACCOMPLISHED. AFTER BREAK; RIGGING PROC WAS STARTED WITH 2 TECHNICIANS IN BUCKET STYLE MANLIFT ON L-HAND SIDE OF VERT. HYD PRESSURE WAS NEEDED TO CTR ELEVATORS AND GIVE CORRECT FREEDOM OF MOVEMENT AT RIG PIN P1. AFTER RIGGING ADJUSTMENTS; FREEDOM OF MOVEMENT AT RIG PINS P1; P2; P3; AND P4 WAS GOOD. THE NUT COTTER PINS; NUT SAFETIES AND ROD END WITNESS HOLES CHKED GOOD. 2 TECHNICIANS WENT TO COCKPIT AND 1 WAS AT THE ELEVATOR AREA. OPS CHK WAS PERFORMED BY DOING 4 COMPLETE UP AND DOWN CYCLES OF ELEVATORS; BY INDIVIDUAL HYD SYS AND BY ALL SYS RUNNING TOGETHER. EACH CYCLE FULL UP AND DOWN TRAVEL ON STATUS SCREEN INDICATOR WAS VERIFIED. ALSO AT EACH CYCLE MDC DEGREES OF MOVEMENT WAS VERIFIED TO BE THE SAME AS BEFORE SVC BULLETIN STARTED. LATER THE ACFT WAS AT THE GATE AND THE FLT CREW RPTED THAT THE ELEVATOR WAS JAMMING UP. THE FLT WAS CANCELED AND THE ACFT WAS TAKEN BACK TO THE HANGAR. ANOTHER MECH FOUND THAT WE HAD INSTALLED THE CTL ROD BACKWARDS AND WAS CAUSING THE JAMMING. NOT SURE HOW WE GOT THE RODS MIXED AROUND; BUT THE OPS CHK WENT GOOD AND THE ELEVATOR MOVED FREELY WITH NO JAMMING. OPS CHK WAS GOOD ACCORDING TO THE INSPECTOR. 1 INSPECTOR PERSON; THE LONG PROC TIME AND WORKING FROM A MANLIFT CREATE AN INTERRUPTION DISTR TO TECHNICIAN AND INSPECTOR. WORKING FROM A BUCKET STYLE MANLIFT WHICH IS SMALL FOR 2 PERSONS AND TOOLS. THE BUCKET IS CONSTANTLY HAVING TO BE MOVED L; R; UP AND DOWN TO ACCESS AREAS NEEDED. ALSO MOVING FROM ELEVATOR AREA TO FLOOR FOR TOOLS; PARTS AND INSPECTOR. ACFT WAS MOVED TO HANGAR FOR TROUBLESHOOTING. FIRST SHIFT TECHNICIANS FELT THAT COLUMN MOVEMENT WAS OK. SECOND SHIFT TECHNICIANS FELT MOVEMENT AT FULL AFT WAS STIFF. A THIRD SHIFT TECHNICIAN WHO HAD PREVIOUSLY COMPLETED THE SAME SVC BULLETIN AND INITIALLY MISPOSITIONED THE RODS AT NEW LEVERS FOUND THE PROB AREA.