What was found
LEFT AND RIGHT CLASS 3 ELECTRONIC FLIGHT BAG, EFB, WILL NOT DISPLAY IMAGE. APPEARS TO BE RECEIVING POWER. R & R LT AND RT ELECTRONIC FLIGHT BAG DISPLAYS AND RELOADED EFB SOFTWARE IAW SOFTWARE LOAD PROCEDURE FOR L3 EFB DOC 945-6731-001. EFB DISPLAYS GROUND CHECK OPERATIONAL. NOTE: ONCE THE UNITS WERE RETURNED TO THE SHOP, IT WAS DISCOVERED THAT THE LITHIUM/ION BATTERY HAD SWELLED INDICATING BATTERY OVERHEAT.