What was found
CABIN AIR COMPRESSOR R2 CABIN AIR COMPRESSOR R2 HAS FAILED OR HAS A FAULT, IS UNAVAILABLE, OR HAS BEEN SELECTED OFF. STATUS CAC R2 WITH FAIL HAD BURNING SMELL IN COCKPIT FOR 1 MIN CREATED SECOND LOG PAGE DUE TO SMOKE OR FUMES REPORTED IN CABIN. INTERROGATED FAULT HISTORY. FOUND 1 FAULT FOR CAC R2 SURGING. PER FIM DMC-B787-A-21-50-F1-90A-421A-A, NO MORE MAINTENANCE ACTION NECESSARY, AS ONLY 1 SURGE HAS BEEN NOTED IN HISTORY. FOUND CORRELATING MESSAGE 24-50357. TROUBLESHOT REF FIM DMC-B787-A-24-10-F5-E0A-421A-A. REMOVED AND REPLACED COMMON MOTOR START CONTROLLER (RIGHT 2 CAC), M2415041. OP CHECKED GOOD. MESSAGE EXTINGUISHED, NO FURTHER FAULTS NOTED.