As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WELS BATTERY NNEDS TO BE REPLACE, UNABLE TO COMPLETE DO TO AIRCRAFT NOT TAKING DB/OPS SOFTWARES FOR DOOR 1 LEFT HAND PRIME WELS CONTROL UNIT. REPLACED PRIME WELS CONTROL UNIT AT L1 DOOR AND TESTED WELS GOOD. PER AMM 33-51-07.