How do I check for hidden bulkhead corrosion

I was once told that bulkhead corrosion is like an iceberg.... 10% on the suface, 90% below.
Buster is solely responsible for global warming and developing the super lightweight Bulkhead Made a great job of the replacement tho! Great pics

arc - you fill me with confidence .... falsely assumed confidence but confidence none the less

mines probably going to look similar before - and at the end it should look similar - probably not - probably catch fire and melt

at least someone else has been mad enough to attempt it .

im practicing my welding as much as i can atm to get up to scratch for the big one at the start of the big thaw !