transission question to flush or not to flush

[Gyrospiro]

i bought a 2006 ocean edition. it has 210,000 miles, the transmission was rebuilt at 160,000.
when i looked at the paperwork it says it was filled with synthetic atf when rebuilt....

what should i do flush with full synthetic or flush with the approved fluid or leave it alone.

it seems to be shiftig fine.

thank you

[MoVolvos]

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