As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR RETRACTION, THE NR 1&2 ENGINE REVERSERS DISAGREE EICAS CAUTION MESSAGE APPEARED. DURING GEAR EXTENSION THE MESSAGE EXTINGUISHED. FOLLOWED FIM FOR ENG REVERSER DISAGREE FIM ASSOCIATED NOSE PROXIMITY SENSOR FAILED CMC MESSAGE TO CAUSES ISSUE. R & R THE NOSE GEAR WOW SWITCH