As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
""GEAR DISAGREE"" WARNING AFTER TAKEOFF IN KBUF,AND ""PROX SYS FAULT""STATUS MESSAGE DURING WARNING. WENT AWAY (BOTH MESSAGES) 20 SECONDS LATER W/O RUNNING QRH. PROCEEDED WITH NORMAL OPERATIONS. *NOTE : RIGHT MAIN GEAR "" AS PER MOTR, REMOVE+REPLACED PROX SENSOR PX18. REMOVED +REPLACED RT UPLOCK SENSOR PX18 IAW AMM 32-61-05. OPS CHK GOOD IAW AMM 32-61-00. PERFORMED GEAR SWING IAW AMM 32-30-00. REFER TO LOGPAGE 3485428-1 FOR CAT II RELEASE.