As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING NON RELATED MX ON N125EC SN 7065 A CRACK WAS DISCOVERED IN THE LT AFT 5600 BULKHEAD IN THE AREA OF THE MOUNTED VACUUM PUMP. THE ACFT WAS GROUNDED AND MX NOTIFIED. CHOSE TO DO A PRECAUTIONARY CHECK OF OUR OTHER 3 ACFT ON SIGHT AND FOUND CRACKS IN THE SAME AREA ON N485UH SN 7036.