Hello,
yes, it would be much better to have a repaired area still marked yellow or red, even if it has been repaired - some kind of reminding you there WAS damage, so you will not go to 250 metres again
What would be cool was to mark some special equipment in a colour to show it has been repaired and is prone to break down after some time.
They even put wooden beams under critical places to support the pressure hull or some flange, so this would surely have reminded you ...
This sim is quite advanced, but i became aware that the air compressing system is not modelled correctly: There was not only the Diesel-driven Junkers-compressor, but some smaller ones working with electricity. So you would well be able to replenish at least some pressure tanks submerged as long as there were some Ampéres left in the batteries, to consistently blow tanks that have been damaged and thus keep your depth.
Greetings,
Catfish