B767-300 CREW HAD THE RUDDER CTL FREEZE JUST BEFORE LNDG ON RWY 4R AT ORD.

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OTHER THAN THE FINDINGS OF ACR MAINT I ONLY KNOW WHAT HAPPENED TO ME; NOT WHY. CORRECTIVE MAINT OCCURRED. SCENARIO ATTACHED. FLT ABC; IAD-ORD. WAS ALL NORMAL UNTIL ABOUT 5 SECONDS FROM TOUCHDOWN UNTIL ABOUT 10 SECONDS AFTER LNDG ON RWY 4R; WX VFR; XWIND; APCHING SUNDOWN. A SLIGHT XWIND; AROUND 5 KTS; OBSERVED AT ABOUT 100 FT AGL; FROM R TO L; FLYING A CRAB INTO THE WIND. THINKING 'R AILERON; L RUDDER' FOR THE LNDG JUST PRIOR TO LNDG; WHEN I WAS UNABLE TO APPLY ANY L RUDDER. LANDED IN CRAB. NO RUDDER CTL ON THE GND. I ASKED FO IF SHE WAS 'ON THE RUDDERS.' HER RESPONSE; 'NO.' I STATED TO HER (FO) I HAD 'NO CTL OF THE RUDDER.' I DISCONNECTED THE AUTO BRAKES; STEERED WITH THE TILLER AND WAS STILL APPLYING RUDDER PRESSURE DURING DECELERATION WHEN A 'SNAP' WAS HEARD AND A MOVEMENT OF THE ACFT FELT WHEN THE RUDDER BECAME CONTROLLABLE. THE FO SAID SHE HEARD AND FELT THE 'FREEZING UP.' TAXI TO GATE; HAD ACR MAINT MEET ACFT WHERE WE BRIEFED HIM AND ENTERED LOG WRITE-UP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE ACFT WAS REMOVED FROM SVC. THE FLT RECORDER WAS REMOVED AND A READOUT PREPARED. THE RPTR WAS CONNECTED TO A CONFERENCE CALL AND EXTENSIVELY DEBRIEFED. PARTIES PRESENT ON THE CALL WERE ACR ENGINEERING; ACR FLT SAFETY; ACR MAINT; BOEING AND THE NTSB. THE CAPT WAS UNSURE WHETHER THE FAA TOOK PART. AT BOEING'S SUGGESTION THE RUDDER PCU 'PWR CTL UNIT' WAS REMOVED AND RETURNED TO BOEING. THIS WAS THEN SENT TO THE BOEING HYD LABORATORY FOR ANALYSIS. THE CAPT STATES THAT SOMETHING POSITIVE WAS FOUND; HOWEVER; HE DOES NOT KNOW WHAT IT WAS.