As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTED & UPON GEAR RETRACTION A LOUD CONTINUOUS THUMPING NOISE COULD BE HEARD A LOUD WITH RT MAIN GEAR INDICATION ON EICAS CYCLING, BETWEEN UP & IN TRANSIT EXTENDED GEAR WHICH EXTENDED NORMALLY & LT DOWN. WHEN GEAR HANDLE WAS UP THE LT MAIN & NOSE SHOWED UP JUST THE RT MAIN WAS CYCLING. R & R RT UP LOCK BOX PROX SWITCHES IAW AMM 32-61-01. COMPLIED WITH EXTENSION & RETRACTION SEVERAL TIMES FOUND SYS OK IAW AMM 32-30-00. PROXIMITY SENSOR PN 80-057-01 & SN 6055 SPL 4.