@cryptoscout its for sure you are talking about an exchange were your steem wallet is under maintenance.

Here on Steemit or any other App of the steem blockchain, you always have control of your funds, and you always have access to your wallet with your keys, and you can transfer your funds by using @blocktrades or other gateways that have wallets working.

You can also use Bitshares dex to exchange Steem for other crypto, so you always have control of your funds.

Regards, @gold84