A B737-200 ON TKOF ROLL AT 125 KNOTS EXPERIENCED AN UNCOMMANDED R RUDDER INPUT CORRECTED IMMEDIATELY WITH L RUDDER INPUT.

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IT WAS THE CAPT'S LEG AND THE WX WAS VMC. WHILE ROLLING DOWN RWY 36R AT TPA AT APPROX 125 KNOTS WE EXPERIENCED AN UNCOMMANDED YAW TO THE R. THIS UNCOMMANDED YAW MOVED US SLIGHTLY R OF CENTERLINE. WHEN THIS HAPPENED; THE CAPT WHO WAS FLYING THE ACFT PUT RUDDER IN TO BRING US BACK TO CENTERLINE. V1 WAS APPROX 132 KNOTS. SO; THIS ALL HAPPENED IN A VERY SHORT TIME. THE REST OF THE TKOF WAS UNEVENTFUL. WE CLBED OUT COMPLETED THE AFTER TKOF CHKLST AND THEN QUESTIONED EACH OTHER TO SEE IF ANYONE HAD INADVERTENTLY PUT A RUDDER INPUT IN. AFTER CONCLUDING THAT NEITHER OF US PUT ANY INADVERTENT INPUTS IN WE ONCE AGAIN SCANNED ALL INSTRUMENTS AND SYS AND EVERYTHING WAS NORMAL. WE CALLED OUR FLT DISPATCHER; AND HE THOUGHT IT WAS BEST TO GO BACK TO TAMPA BECAUSE THE WX WAS VMC. THE WX AT OUR PLANNED DESTINATION (NEWARK) WAS LOW CEILINGS AND RESTRICTED VIS. SO WE CONCURRED WITH THE DISPATCHER. WE RAN ALL OF THE NORMAL CHKLST AND PROCEEDED BACK TO TAMPA. THE REST OF THE DESCENT; LNDG AFTER; LNDG AND ENG SHUT DOWN WENT NORMAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THAT MAINT REPLACED THE RUDDER PWR UNIT. THE RPTR SAID THE TEST FLT AFTER THE PWR UNIT REPLACEMENT WAS NORMAL.