As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING JC335003, FUNCTIONAL TEST OF EMERGENCY BATTERY PACK CAPACITY, POWER PACK 21LN FAILED CHECK. REMOVED AND REPLACED POWER SUPPLY 21LN, P/N 3301-51 S/N ON 2123 S/N OFF 2128. ALL WORK DONE IAW SAAB AMM 33-50-10. OPS CHECK GOOD.