The funny thing is that he know spi's do it, yet couldn't tell the customer has a zetec. I wouldn't let him touch another thing. Don't blurt something out to try and gain ground with the customer if you don't know anything about it.
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Will aka Misfire
2010/2011/2012/2013 Ford Master Certified Service Advisor
2003 LX "traded in"/2010 SES "traded in"/2012 SEL Hatch "current"