Loss of power in the indmar 410. Any ideas please

Need some ideas here. Any will be good. So I have a 2013 MB F21 Tomcat. It has the Indmar 410 in it and I have a Acme 2079 high altitude prop on it. Up until this last weekend it has been a true power house. We ride full ballast 1800lbs and 600-650 lbs in the nose. Around 3-8 adults at any given time. This last weekend we had 5 adults all between 120-200 lbs and 2 kids 60lbs max. The boat has never had a single issue getting on plane. Most the time I don't even use the cav plate. Well the boat has no power now. Takes forever to get on plane even with the plate down. It honestly feels like someone swapped engines and prop on me. So of course it is under warrantee but I'm just confused???? Just wondering if anyone has had this happen to them or has any ideas at all on the loss of power. The dealer hooked up there computer and said there was no errors. Water test tonight (may 16)... Thanks for any info.