Thanks Vilas for the insight.
Are we allowed to use the fuel cross feed after ascertaining that the fuel leak is from the wing tank? Procedure says do not apply fuel imbalance procedure, but does it mean we cannot use the crossfeed as well? The confusion I have stems from the fuel diagram which is not very clear to me. With the fuel crossfeed on, does fuel come from the good wing tank and goes into the opposite leaking tank, or just straight through into the Engine of the leaking side tank?