Rainboe..I apologise for only being a PAX but...
Did this a/c return to the gate after (a) Fuel spillage was initially observed and crew advised..(ie crew also observed problem and deemed it serious enough to warrant engineering inspection), and (b) same spillage was observed for a 2nd time...
I'm sorry but if I give great credence to the crew so if (a) warranted inspection as far as I'm concerned I'm damn sure (b) did as well.