What was found
ON DESCENT, DUE TO RUNWAY CHANGE, EXTENDED LG AT 235 KTS, ONCE ON DESCENT RETRACTED GEAR AT 220 KTS, BOTH MAIN GEAR INDICATED UNSAFE UP ON RETRACT. EXTENDED GEAR & GOT 3 GREEN. PERFORMED A TEST OF PSEU SENSORS, ALL INDICATED OKAY. THERE WERE NO CURRENT FAULTS LISTED IN THE PSEU. VISUALLY INSPECTED ALL UP & DOWNLOCK & UPLOCK TARGETS & SENSORS, NOTHING ABNORMAL FOUND. CONSULTED WITH MOCC & WAS INFORMED THIS IS AN SDR. THE ONLY MM ADJUSTMENT TEST PROCEDURE REQUIRES A GEAR SWING. STILL RESEARCHING A POSSIBLE MM IAW MX. COMPLIED WITH IAW MM CH 32-61-15-5 FOR PROX SENSORS.