Having done several assessments of the 61010 standard (including the harmonized versions), there are a few things to note.
The test labs (TLs) that support the certification bodies (CBs) rarely share their checklists with anyone but the accrediting bodies (ABs), even though due to a peer review process the others see them. Hence, between them they are generally fairly consistent. As an example, between UL, CSA, and ITS, the checklists will have differences for their own systems, but the technical content will be the same.
The technical content is based directly from the standard(s) to include the applicable -2s and any other required standards and goes test by test. Typically includes listing any and all standards applicable for that test, whether there are any already-certified components, what is under test, the test equipment (e.g., fixtures), calibrated equipment, personnel, environmental conditions, conditioning requirements if any, descriptions (beginning, end, and others points of significance), often pictures also, decision whether it meets that specific requirement, and engineering sign-offs at appropriate points. All this for every test. The CB takes all the information and determines if the item can receive the mark, and also whether a post-certification inspection requirement is needed and at what frequency.
That is why test test/certification process takes so long and is so expensive. The TLs will be accredited under ISO/IEC 17025. CBs will be accredited under ISO/IEC 17065. Inspection bodies (IBs), if post-certification inspection is required, will be accredited under ISO/IEC 17020.
Hope this helps.