As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DEPARTURE ROLL OUT OF BOISE WE NOTICED AN ELECTRONIC BURNING SMELL. BOTH FLIGHT ATTENDANTS CONFIRMED THE SMELL THROUGHOUT THE CABIN. SMELL DISSIPATED AS WE CLIMBED OUT. ON DESCENT THE SMELL RETURNED. (FLT#3918) CLOSED REMOVED AND REPLACED THE AFT LAV LIGHT BALLAST DUE TO THE CIRCUIT BREAKER POPPING (CLNG/LAV LT GSVC) AND BURNT SMELL COMING FROM WITH IN THE BALLAST CASING. ALL WORK AS OUTLINED EMB AMM. OPS CHECK GOOD.