What was found
UPON PERFORMING TASK CARD 78233001, STEP 2, MULTIPLE EMERGENCY LIGHTS FAILED TO STAY ILLUMINATED FOR THE REQUIRED 15 MIN MINIMUM. ACFT GROUNDED. REPLACED EMERGENCY LIGHT POWER SUPPLY M1670, INSTALLATION TEST NORMAL, REF MM33-51-06. REPLACED BATTERY PACKS AT RT SIDE, STN 727C, LT AND RT PACKS IN AFT GALLEY O/H CEILING. PACK ABOVE WAS REPLACED AT LT SIDE STN 727C. SECURITY SEAL PLACED ON AFT GALLEY O/H CEILING PANEL. OPS NORMAL REF MM 33-51-06-960-805.