Hi guys would love your thoughts on this, suffered coolant leak , garage removed supercharger , replaced oil cooler gasket and all coolant pipes , replaced water pump removed 7 corroded bolts from engine block and and both cylinder heads then carried out supercharger oil service refitted it engine oil and filter coolant antifreeze service , £2750, Two days later engine misfiring so then took it to a jag specialist , a seized injector due to water / liquid ingress and £2000 bill to get it out , the first garage are saying its complete bad luck and the two things are not connected , your thoughts?