if you are changing to 65,000 for year 2 you still need to maintain 400 k for months 4-12 as part of the T&C of the year 1 extension. Make sure you have 12 monthly 65k transfers at the time of year 2 extension application.
and if you cannot show you maintained the funds the visa is void and technically you would overstay for 1 year at the next extension. Technically … anyone having an experience.