What was found
CREW REPORTED THEY HAD ELECTRICAL PROBLEMS, A/C TIE NR 1 FAIL, TR NR 1 FAIL. MX CONTROL ADVISED CREW TO RETURN TO BASE (MAIMI). A/C RETURNED TO BASE, LANDING NORMAL. MX PERFORMED T/S IAW FIN 24-20-46-00 FIG 140, PERFORMED TRS OF EPCU IAW 24-08-01. ALL TEST SATISFACTORY, ENGINE RUN ACCOMPLISHED. NO FAULTS NOTED, A/C RELEASED FOR SERVICE.