While surveying lately a 2008 Jeanneau Sun Odyssey 36i, my client and myself realized during the haul out inspection that 30% of the rudder blade was missing, following a bad grounding.
Needless to say, this was kind of a turn down for the client. However, and despite the dramatic aspect of it, such issue is pretty easily repairable, at least for any FRP professional. See above how, step by step.