BAROREF, consult your training manager in case your action whatever it was was regarded as failure. The scenario presented by you is dodgy one, not to say condemned to fail one or no failure at all depends on how one sees it. It falls into LOFT session category not the skill test. Many reasons behind it however there's part D and approved upgrade syllabus. The TRE might deviate from it but it has to be well justified and corresponding to the skill test requirements. If the check airman did deviate from the approved syllabus and failed you partially or completely again consult your part D for failure procedure. However bear in mind that examiners do represent CAA during the check. This part is simply resolved by FAA with the requirement to pass the oral exam where the check airman assesses one's knowledge in different fields like R&R aircraft systems etc before it comes to the sim ride. Good luck.
Cheers
