As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS - FLT 109 - RIGHT MAIN GEAR UNLOCK AND DOOR LIGHTS REMAINED ON AFTER GEAR RETRACTION. RECYCLED GEAR AND LIGHTS WENT OUT BUT ONLY AFTER APPROX 5 SECONDS AFTER OTHER LIGHTS HAD GONE OUT. BRIEF DISPLAY ON ECAM OF GREEN HYD RESERVOIR AIR PRESS LOW. PERF BITE AND FOUND PROX CONTROL UNIT FAULTING. REPLACED PROX CONTROL UNIT AND PERF REQ TESTS, GROUND CHECKS OK. (M)