NCT CTLR DESCRIBED PLTDEV INVOLVING LOST PLT WHO ENTERED SFO CLASS B AND CONFLICTED WITH ACR LNDG SFO.

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ACFT X CALLED THE MORGAN SECTOR; REQUESTED VFR FLT FOLLOWING TO RHV; AND SAID HE WAS UNSURE OF HIS POS. I TOLD PLT TO SQUAWK XXXX. NO XPONDER WAS OBSERVED ON MY DISPLAY. I ASKED ACFT X DEP ARPT AND CURRENT ALT. THE PLT SAID DEPARTED MCE AND NOW AT 4400 FT. I ISSUED RHV ALTIMETER; TOLD PLT TO RESET XPONDER; AND ASKED CURRENT HDG. PLT SAID HDG 310 DEGS. I ASKED PLT WHAT HE SAW; AND HE SAID A RESERVOIR. AN INTERMITTENT PRIMARY TARGET WAS ON THE TURLOCK DISPLAY NEAR SAN LUIS RESERVOIR; WHICH I THOUGHT MIGHT BE ACFT X. I SUGGESTED ACFT X FLY WBOUND IF ABLE; WHERE THERE IS BETTER RADAR COVERAGE. I ASKED THE PLT IF HE SAW ANYTHING ELSE AND HE SAID A BRIDGE. I ASKED HOW LONG SINCE HE HAD DEPARTED MCE AND HE SAID ABOUT AN HR. THINKING ACFT X MIGHT NOW BE N OF THE BAY AREA; I CALLED C1-1 TO SEE IF THEY HAD OBSERVED AN XXXX SQUAWK CODE IN THEIR AREA. REPLY WAS NEGATIVE. I THEN HAD PLT SQUAWK 7700 AND CALLED TMU TO SEE IF THEY SAW A 7700 CODE ANYWHERE. REPLY WAS NEGATIVE. THE PLT THEN SAID HE SAW AN ARPT WITH RWY 29 AND RWY 30R; WHICH IS SJC. TMU CALLED AND SAID THEY SAW 7700 CODE 8 MI SE OF SFO NEAR SQL. I INSTRUCTED ACFT X TO TURN SBOUND AWAY FROM SFO FINALS. I THEN INFORMED WOODSIDE SECTOR ABOUT THE ACFT AND XFERRED COM TO 135.65. SUPPLEMENTAL INFO FROM ACN 738460: WHILE WORKING THE WOODSIDE POS; I CLRED A CRJ FOR THE TIPP TOE VISUAL RWY 28L APCH. AFTER HE WAS CLRED; HE STATED HE HAD TFC UNDER HIS NOSE MOVING TO HIS 10 O'CLOCK POS. I ASKED FOR THE ACFT'S ALT AND HE SAID ABOUT 4000 FT. THE TARGET WAS NON-IDENTED/NON-XPONDER AT THE TIME OF THE CONFLICT. AFTER THE MORGAN CTLR CALLED ME AND ADVISED ME THAT HE HAD A DISORIENTED ACFT/PLT ON HIS FREQ IN THE SQL AREA; I LATER IDENTED THE ACFT ON A SBOUND HDG OVER THE OSI VOR AT 4500 FT. I DIRECTED THE ACFT TO THE RHV ARPT.