hey guys i am the tech you are all talking about , i am having a chuckle at the miss guided accusations being thrown around.
In can write an essay here defending myself but i wont.
I am sorry he wasnt happy with the service because honestly my number one business rule is to keep the customer happy but i obviously fail
in this instance.
25 years as a pinny tech and 1 unhappy customer is still pretty good i would say.
cheers guys.

Mate, I would be defending myself and explaining in detail what went wrong, because the way it reads so far, u look like someone who tried to rip off a member and just tried to take advantage of someone so u could trade his machine in for peanuts and make money off him. To say you have only had 1 unhappy customer in 20 years is yet to be determined.  
I know people who have been working in the same job for 20 years and they are farking hopeless, so time in a job means nothing.
Unless u make a fair dinkum attempt at explaining what went wrong with this service call, u MAY be labelled a bullshit artist and a con man.
I am not saying u are, i have never met you, but it aint looking real good for your reputation until you provide a well wriiten response. There is no such thing as a dud machine, but there certainly is such a thing as a dud pinball tech. Defend your reputation with a decent response I say. Your name is worth protecting IF u are right !