What was found
CLE FLT 2629 - THE CREW REPORTED A SPOILER FAIL, SPS ADVANCED, LANDING GEAR AIR/GROUND FAIL/E1 IDLE STOP FAIL, AND WOW INOP MESSAGE ON THE EICAS WHILE TAXIING. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE LANDING GEAR ELECTRONIC UNIT (LGEU). OPERATIONAL CHECKS WERE GOOD.