The CRS Signatory, should, at least, have an oversight of the work carried out, and it's him/them that are risking their licence should the old guy miss anything.
Also, dependent on the work carried out, ie Flight controls and or Powerplant, there may be Independent Inspections due.
Your Insurers would indeed be able to wiggle out as you have now posted that the aircraft is being maintained without the oversight of a licensed engineer in a public forum.
Last edited by Emeroid Eng; 31st Oct 2018 at 08:29.