Danny Keane at IGR Services (behind the Athos Hotel in Nidri) certainly used to offer guardiannage, but whether he still does I don't know. However he could certainly point you towards someone who will!! Try ringing IGR on 00 30 2645 092601
I walked past the IGR sign on the seafront at Nidri only last Sunday, before flying home. Of course that doesnt prove that its still valid, but the sign looked recent.
Danny no longer does guardiannage .The sign on the seafront may have been IBA - ionian boat assisstance run by kelvin Morris formerly of Neilsons .I have just started using them for this service so cant comment on reliability/service as yet but can pay by credit card , receive a proper bill , and can contact them with ease .Check their website out (google Ionian boat ass) and it pops up complete with contact details and lots of other useful info .They have fleet of ribs and staff at their disposal rather than a one man band trying to organise lots of boats and succeding with none !Im hoping for good things as they are relativley new . Horatio todd also does this service and offers surveys , I havnt got his number but Danny at IGR will know or ask at Vliho yacht club where he can often be found . Hope you get fixed up okay .