What was found
TYS - A/C RETURNED TO BASE AFTER LEAVING EWR TO BNA WHEN CREW HAD A ECIAS MESSAGE OG THE BLEED 2 OVER TEMP IN ICING CONDITIONS. MAINTENANCE FOUND THE ACESS PANEL 414CB LT PANEL TO THE FAN AIR VALVE/PRE COOLER INSTALL ON THE RT SIDE AND THE 424CB RT PANEL TO THE FAN AIR VALVE /PRE-COOLER INSTALL ON THE LEFT SIDE, CAUSING BOTH PRE COOLERS TO BE BLOCKED. RE-INSTALL PANELS IN THE CORRECT POSITION. PERFORMED OPS TEST OF THE AIR BLEED SYSTEM IAW EMB 145 MM 36-00-00. OPS CHECK GOOD AND WAS RELEASED.