A B757 HAS DAMAGE TO THE LEADING EDGE SLAT RESULTING IN THE FLT CREW DECIDING TO DIVERT TO SEA.

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DURING FLAP RETRACTION FROM POS #1 TO 'UP' POS; A NOISE WAS HEARD. LATER DURING CLBOUT; FLT ATTENDANTS RPTED A VIBRATION AND NOISE. CONTINUED TO TROUBLESHOOT AND GET A HOLD OF DISPATCH. FLT ATTENDANTS FELT VIBRATION IN FLOOR. UNABLE TO ESTABLISH VOICE COMS WITH DISPATCH. HAD FLT ATTENDANT CHK CONDITION OF LEADING EDGE FLAPS. FLT ATTENDANT INFORMED US THERE WAS DAMAGE TO THE INBOARD LEADING EDGE SLAT AND R WING. CONTINUED TO TRY TO ESTABLISH VOICE COMS WITH DISPATCH BUT WAS UNABLE. WE WERE 114 MI FROM SEA AND CAPT MADE DECISION TO DIVERT TO SEA. INFORMED DISPATCH VIA ACARS THAT WE WERE DIVERTING DUE TO DAMAGE IN R WING AND THAT THE ACFT WAS FLYING NORMALLY. FLT ATTENDANTS AND PAX WERE INFORMED OF DIVERSION. NO EMER WAS DECLARED. FLAPS EXTENDED NORMALLY AND CAPT MADE A NORMAL LNDG IN SEA. SUPPLEMENTAL INFO FROM ACN 628922: THERE WAS A WRITE-UP SAYING THE GAP SEAL ON THE FLAPS WAS COMING OFF AND WAS REMOVED. WE WERE CONCERNED THE SLATS WOULD NOT COME OUT FOR A NORMAL LNDG. THEY DID COME OUT JUST LIKE A NORMAL LNDG. WE LANDED FLAPS 30 DEGS NORMAL LNDG.