A FOKKER 100 WAS DISPATCHED WITH A DEFERRED ITEM TO TROUBLESHOOT AND REPAIR A R MAIN LNDG GEAR DOWNLOCK SWITCH. SEVERAL PREVIOUS RPTS ALL CLRED WITH GND CHKS OK.

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IN SUM: THE ACFT ARRIVED ON MY GATE WITH THE FOLLOWING WRITE-UP: R MAIN LNDG GEAR DOWNLOCK WARNING LIGHT CAME ON DURING CLB OUT AT 2000 FT. I ACCOMPLISHED THE FOLLOWING: NO FAULT MESSAGE ON THE MAINT FLT DATA UNIT WHEN WE CHKED; CYCLED THE MAIN LNDG GEAR DOORS SEVERAL TIMES; ALL INDICATIONS WERE NORMAL. ITEM WAS DEFERRED FOR FURTHER EVAL AND TROUBLESHOOTING ON MAINT OVERNIGHT LAYOVER; OK FOR SVC. THIS ACFT HAD A PROB THAT WAS NOT SHOWING UPON ARR AT THE GATE IN ZZZ. WE TRIED TO DUPLICATE THE WRITE-UP BUT COULD NOT. THE MAINT PEOPLE IN XXX AND YYY THOUGHT THE AIRPLANE SHOULD HAVE BEEN SIGNED OFF AS GND CHKS OK. I PROGRAMMED THE ACFT TO BE TROUBLESHOT AND THE COMPANY FAILED TO FOLLOW THROUGH. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE R MAIN GEAR WARNING SYS WAS NOT DEFERRED. WHAT WAS DEFERRED WAS FURTHER TROUBLESHOOTING THAT WOULD BE REQUIRED FOR A PROB THAT COULD NOT BE DUPLICATED ON THE GND. RPTR COULD HAVE CLRED THE ITEM BUT THE AIRPLANE ALREADY HAD 2 RPTS THAT COULD NOT BE DUPLICATED. RPTR BELIEVES THE COMPANY PLANNING DEPT IS AT FAULT FOR ALLOWING THIS AIRPLANE TO GO THROUGH 2 MAINT STATIONS WITHOUT RPTR STATED HE HAS 28 YRS LINE MAINT EXPERIENCE. THE AIRPLANE INVOLVED WAS A FOKKER 100. THE FAA HAS NOT CONTACTED THE RPTR.