What was found
AIRCRAFT WAS NOT GROUNDED: REF MIC 1921117. PERFORMED OPERATIONAL CHECK OF EMERGENCY POWERSUPPLY UNITS BY BITE-CHECK IAW AMM 33-51-00. FAILURE MESSAGES EPSU INT LOAD FWD L, AND EPSU INT LOAD AFT L FOUND. REMOVED AND REPLACED EXIT LOCATER SIGNS AT 43WL, 52WL, AND 53WLIAW AMM 33-51-17. OPS CHECKS GOOD.