A CRJ-200 FLIGHT CREW REPORTS RIGHT SPOILERON INDICATING AN 'UP' ARROW ON THE FLIGHT SYNOPTIC PAGE WITH THE SURFACE STOWED ON TAXI. SPOILERON WAS PREVIOUSLY REPLACED; BUT REQUIRED BUSHINGS WERE NOT INSTALLED.

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ACFT X CALLED IN TO ZZZ WITH A RPT OF THE R SPOILERON INDICATING AN UP ARROW ON THE FLT SYNOPTIC PAGE WITH THE SURFACE STOWED ON TAXI. MR X RESPONDED TO THE CALL. I LATER RESPONDED TO ASSIST IN THE TROUBLESHOOTING OF THE PROB. AFTER SOME TROUBLESHOOTING AND INVESTIGATING OF THE MAINT LOGBOOK; WE REALIZED THE R SPOILERON INBOUND PCU HAD BEEN REPLACED 1 FLT LEG PRIOR TO ZZZ1. WE CONCENTRATED OUR EFFORTS ON THAT PCU AND REALIZED THAT THE PCU PISTON ROD END TO SURFACE ATTACH POINT DID NOT HAVE THE REQUIRED BUSHINGS INSTALLED. WE INSTALLED THE 2 BUSHINGS AND PERFORMED THE RIGGING OF THE PCU PER THE MAINT MANUAL. THIS RECTIFIED THE DISCREPANCY. MR X SIGNED THE MECH BLOCK AND I PERFORMED THE DELEGATED INSPECTOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE LEFT AND RIGHT SPOILERONS HAVE TWO PCU'S AT EACH SPOILERON. THE MISSING BUSHINGS ON THE RIGHT SPOILERON AT THE INBOARD PCU WAS ENOUGH TO CAUSE THE LINEAR VARIABLE DIFFERENTIAL TRANSDUCER (LVDT) TO NOTICE A SURFACE DISPLACEMENT OF THE SPOILERON AND GIVE AN 'UP' INDICATION ARROW ON THE PILOT'S FLIGHT SYNOPTIC PAGE.