As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 620, JFK-BUF, WHEN LG LEVER WAS SELECTED TO DOWN RT MAIN INDICATED UP AND LG DISAGREE EICAS ILLUMINATED. ACCOMPLISHED LG DISAGREE CHECKLIST. GEAR REMAINED RETRACTED. PERFORMED ABNORMAL GEAR EXT AND RT MAIN EXTENDED AND INDICATED NORMAL WHEN ALT GEAR EXT LEVER WAS PULLED. REMOVED AND REPLACED RT MLG UPLOCK ACTUATOR PER MM 32-31-03, OPS CHECK AND LEAK CHECK OK. OPERATED GEAR SEVERAL TIMES AND NO DEFECTS NOTED.