overruling another tester

Hi guys. I had my mots covered by a floating mot tester when i was on holiday. He failed a vehicle on insecure exhaust as it had corroded through a front bracket. When i returned from holiday my boss asked me to look at it without explaining. He asked my opinion and i said it was a little harsh as was still suported by other brackets and mounts. He is struggling to get an exhaust for it and i think he wants me to pass it but surely if someone else has failed it i cant overule. Surely the failure has to be rectified even if its by welding or something. Where do i stand? Thanks