A couple of quotes from the report:
"All the [flight control system] assemblies failed an evaluation against all IPC A-610 classes due to quality and workmanship issues. Examples included misaligned components, burnt insulation, the use of solder bridges, excessive flux residues and a power connector that appeared to be installed in the incorrect orientation..."
"During the course of the investigation the operator demonstrated little knowledge or understanding of appropriate industry standards, in particular, those relating to airworthiness and for developing electronic hardware and software."
https://assets.publishing.service.go...g_na_03-21.pdf