I have a Yamaha 2013 4 stroke. Bought it brand new back in 2015. Have 1300hour on it then few months ago starting to having trouble. Found out that on the block exhaust had a hole from corrosion and the whole lower part where the oil pan exhaust has more. JB weld twice abs only lasted weeks. Can anyone help me tell me what it this happening and if there’s anything I can do to fix it. Does welding help? Called my dealer but they didn’t know and not very helpful. Email Yamaha both but didn’t have response yet