What was found
DURING TAXI IN WITH RT ENGINE SHUTDOWN, APU GEN WOULD NOT CONNECT COCKPIT, EXTERIOR, AND CABIN ELECTRICAL BLANKED. F/A SAID EMERGENCY LIGHTS DID NOT COME ON. 2 RESETS TO RESTORE. OP'S CHECK OF RT AC BUSS, OP'S CHECK GOOD IAW AMM 24-50. EMERGENCY LIGHTS DID COME ON WHEN RT BUSS WAS CUTOFF.