Sam Asama
You are correct re due diligence. Serco is supine in the face of the ICAA. Witness the recent 'Audit'. Serco will do whatever it can to keep a contract. If the ICAA wants a controller gone Serco will oblige them.
However, in Serco's favour they have and do try to place controllers at their other facilities, assuming a suitable vacancy is available.
Cheers