I would ring them up to make an appointment, both of them. I would however, also make it very clear that you do not seek any further comments, but rather their comments are unclear to you AND your supervisor.
I am aware that the university does not allow such contacts, but in your case it's different because you don't want any advice, all you want is a clarification of the required changes, and this is perfectly legitimate. If in doubt, ask your supervisor or head of department concerning the rules in such a case that neither you nor your supervisor understand the comments by the examiners. As your supervisor doesn't understand them, it is very clear that clarification is definitely required as otherwise you are unable to proceed in making these changes.