Well lets think about this logically.
USA capital is lost….ALLIES CONCEED
Russian capital is lost…who cares when it comes to ships.
German capital is lost…Axis concede.
Italy capital is lost…who cares, it is Italy.
Japan capital is lost…Axis concede.
ANZAC capital is lost…who?
China is decimated… why do I care?
So all we are left with is the UK.
UK is the only power that by the rules has 2 capitals and two separate economies.
Now lets say that UK Europe falls. UK still has a capital in the far East. At this point is when the debate starts.
Can UK ships only repair on the Pacific map on UK / Allied ports? According to the rules the UK Europe side of the map can only perform Combat moves and non Combat moves BUT the Pacific UK map they can still perform purchase and repair. So, the only free UK repair services can be found on the Pacific map for UK capital ships.
Now lets throw a wrench into this discussion. What happens if a USA capital ship is off the shores of Egypt, UK Europe has fallen BUT Egypt is still in UK hands. Can the USA repair off the UK Egypt port because USA ships can repair in the build and repair phase of their turn? Of course they can because USA ships will pay cold hard cash to the Egyptians to perform the repairs. Plus, by the rules…USA Capital ships can repair on any UK Europe map port as long as the USA capital has not fallen.
IF UK naval units are on the Pacific map they can be repaired, regardless if the unit was a Europe or Pacific map capital ship. If it is in a Pacific Naval port they can be repaired.