"We are always looking for ways to operate" is grammatically correct.
"Effectively to serve our members" is correct as well.
"This requires as to review" contains an error. The phrase should be "requires us to review," as "us" is the correct object of the verb "requires."
"That we are organized in the right way to best meet the needs of our members" is correct.
Thus, the error is in option (3), where "as" should be replaced with "us."