B757-200 CREW DIVERTED TO THE NEAREST SUITABLE ARPT AFTER EXPERIENCING A R PNEUMATIC DUCT LEAK.

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FLT AB LAX-LIH; ON DEC/SAT/03 AT APPROX XA15Z; EXPERIENCED A R PNEUMATIC DUCT LEAK. AFTER PERFORMING THE APPROPRIATE FLT HANDBOOK PROCS; THE EICAS AND OVERHEAD DUCT LEAK CAUTION LIGHTS EXTINGUISHED. AFTER CONSULTING WITH DISPATCH AND SYS ACFT MAINT CTLRS; THE FLT DIVERTED TO SAN FRANCISCO WHERE AN UNEVENTFUL OVERWT LNDG WAS PERFORMED. A CABIN ADVISORY WAS PROVIDED TO THE CHIEF PURSER. COM WITH COMPANY WAS INITIALLY MADE OVER VHF. HOWEVER; AS RECEPTION DETERIORATED; LDOC HF FACILITIES WERE USED FOR A CONFERENCE PHONE PATCH WITH BOTH DISPATCH AND SYS ACFT MAINT. COM FACILITIES WERE ADEQUATE FOR RESOLUTION OF THE EVENT. DUE TO THE R PNEUMATIC DUCT REMAINING DEPRESSURIZED FOR THE BAL OF THE FLT PER FLT HANDBOOK IRREGULAR PROC REQUIREMENT; THE R PACK WAS RENDERED INOP. IN THE CAPT'S JUDGEMENT; CONTINUATION OF THE ETOPS FLT WITH ONLY 1 PACK OPERATIVE WOULD BE IMPRUDENT AND A DECISION TO DIVERT WAS MADE. THE DISPATCHER SUSTAINED THE DECISION. INITIALLY MGMNT REQUESTED A RETURN TO LAX; BUT SUBSEQUENTLY REDIRECTED THE ACFT APPROX 10 ;MINS LATER TO SAN FRANCISCO. SAN FRANCISCO AND LOS ANGELES WERE NEARLY EQUIDISTANT. THE CABIN ADVISORY WAS GIVEN TO THE CHIEF PURSER PRIOR TO THE ANNOUNCEMENT MADE TO THE CABIN. THE COCKPIT CREW ADDRESSED THE PAX AT LEAST 3 TIMES DURING THE DIVERSION TO KEEP THEM INFORMED. THE PAX WERE ADVISED THAT A PRECAUTIONARY LNDG WAS BEING MADE IN SAN FRANCISCO DUE TO THE FAILURE OF A REDUNDANT SYS; THAT THE ACFT WAS SAFE AND A NORMAL LNDG WOULD BE MADE. THE ACFT WAS PROJECTED TO LAND APPROX 24000 LBS OVER MAX STRUCTURAL WT IN SAN FRANCISCO. THE CAPT DEEMED HIS PERFORMANCE OF AN OVERWT LNDG AS THE SAFEST COURSE OF ACTION. ALTHOUGH WINDS WERE RPTED BY ATIS AS CALM IN SAN FRANCISCO; RWYS 19R&L WERE CURRENTLY IN USE. FLT AB REQUESTED RWY 28R AS AN OPERATIONAL NECESSITY DUE TO THE LNDG WT; MISSED APCH PROCS AND COMPARATIVE LENGTH OF RWYS. DISPATCH AND APCH CTL COORDINATED THE REQUEST WITH SAN FRANCISCO TWR. A FLAPS 25 DEG LNDG WITH AUTOBRAKES LEVEL 2 WAS MADE ON RWY 28R. THE CHOICE OF FLAPS 25 DEGS PROTECTED AGAINST AUTO RETRACT SHOULD GUSTS BE ENCOUNTERED AT THE HIGHER APCH SPD NECESSITATED BY THE HIGHER LNDG WT. TOUCHDOWN FORCES WERE LIGHT; AUTO SPD BRAKES AND REVERSE THRUST DEPLOYED NORMALLY; AND MINIMAL BRAKING REQUIRED TO EXIT THE RWY AT TXWY K. APPROPRIATE LOGBOOK ENTRIES DETAILING THE WT AT LNDG AND SYS FAILURES WERE MADE. COM; COORD; AND ASSISTANCE FROM FO WERE EXEMPLARY AND PRAISEWORTHY. ASSISTANCE FROM DISPATCH AND MAINT CTLR WAS TIMELY AND HELPFUL. CHIEF PURSER HANDLED THE CABIN IN AN OUTSTANDING MANNER. PAX RESPONSE WAS POSITIVE DURING DEPLANEMENT. FLT HANDBOOK DIRECTION WAS ADEQUATE FOR RESOLUTION OF THE EVENT. FLT OP DUTY MGR AND LOS ANGELES FLT OFF MGMNT ASSISTANCE WERE OFFERED BY BOTH OFFICES.