A CRJ200 FO COMMENTED THAT IT TOOK GREATER THAN NORMAL FORCE ON THE CTL YOKE TO RAISE THE NOSE TO THE LNDG POS.

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THE FO HAD FLOWN UNEVENTFULLY FROM ZZZ1 TO ZZZ2 WITH THE AUTOPLT ENGAGED. WE BROKE OUT OF THE CLOUDS AT 800 FT AGL ON THE ZZZ2 ILS. THE FO DISENGAGED THE AUTOPLT AT 600 FT AGL AND HAND FLEW THE ACFT TO A LNDG; NOTING NOTHING UNUSUAL UNTIL THE LNDG FLARE. DURING THE FLARE; THE FO COMMENTED THAT IT TOOK GREATER THAN NORMAL FORCE ON THE CTL YOKE TO RAISE THE NOSE TO THE LNDG ATTITUDE. THE LNDG ITSELF WAS UNEVENTFUL. AFTER LNDG; WE BOTH MOVED THE CTL YOKE FORWARD AND AFT SEVERAL TIMES; NOTING THAT IT TOOK GREATER THAN NORMAL FORCE TO MOVE THE YOKE FORWARD AND AFT. YOKE MOVEMENTS OF THE AILERONS FELT NORMAL. I NOTIFIED MAINT CTL AND MADE A WRITE-UP IN THE ACFT MAINT LOG. I SPOKE TO A CHIEF PLT ON THE PHONE ABOUT THE EVENT; ASKING IF IT MET THE CRITERIA FOR A FLT CTL SYS MALFUNCTION REQUIRING NTSB NOTIFICATION. HE SAID THAT SUBMITTING AN IRREGULARITY RPT WOULD BE SUFFICIENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE HAS EXTENSIVE EXPERIENCE FLYING IN THIS TYPE OF ACFT; AND HAS NEVER EXPERIENCED ANYTHING LIKE THIS IN THE PITCH SYS BEFORE. ALTHOUGH MAINT COULD NOT DUPLICATE THE CTL YOKE FORCE RESISTANCE; THEY DECIDED TO CHANGE THE AUTOPLT PITCH SERVO. RPTR ALSO STATED THE ACFT WAS TRACKED FOR ANY SUBSEQUENT PITCH FORCE ISSUES AND SO FAR; APPEARS NOT TO HAVE ANY FURTHER PROBS.