What was found
AIRCRAFT WAS GROUNDED: IN CRUISE FL320 WARNINGS FOR THE FOLLOWING STATUS MESSAGES: PFCS INTERFACE TERR SYST, AOA VANE L/R , FLT REC SYS, CAB ACT AUTO L, ASCP PR1 CON L, WARN SPKR L, STALL WARNING L, WEU CHN L/R, LSCF POWER SUP 2. FLIGHT AIR INTERRUPTED BACK TO MIA. EMERGENCY WAS DECLARED AND WAS OVERWEIGHT FOR LANDING. FOUND FAULTY STAND-BY POWER- DC CONTROL RELAY (K24019) PER FIM 24-33-00-810-816. REPLACED SAME AND TESTED IAW AMM 24-33-07.