What was found
RECIEVED MASTER CAUTIOIN AC SERVICE BUSS, RAN QRH AND CONTINUED IN ARI AND ON GROUND, MESSAGE IS INTERMITTENT, POSSIBLE ELECTRICAL ODOR IN COCKPIT, PULLED CIRCUIT BREAKER PANEL 2, S2. R&R ACFT SERVICE BUS SENSE RELAY K5XD REF WDM 24-50-00. OPS CHECK GOOD IAW 24-51-20.