Wärst du bereit mir einen Gefallen zu erweisen ?

shouldn’t this be “Wärest” instead of “Wärst”

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Both is correct.
“Wärest” is a little old fashioned or poetic.
Normaly it is “wärst”. But even then the question is very formal and not quite fitting with the “du”.
In everyday speech:
“Kannst du mir einen Gefallen tun?”

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