it was reported in the press by Boeing that they had to rewire about a half dozen tankers- and I know some who were involved in trying to fix the mess.
I said nothing about unqualified staff doing wiring- wiring is done by IAM personnel according to O&IR paperwork produced from drawings and lists. The basic problem had to do with multiple paths and separation of wiring issues as compared to allowable commercial. For but one example- virtually all mil spec wiring requires EMP hardening/shielding and separation
Have a nice day !!
From wiki
In July 2014, Boeing recorded a $272 million pre-tax charge to cover a redesign of the tanker's wiring.
[52][53] The wiring issue arose when it was found that 5-10% of the wiring bundles did not have sufficient separation distance or were not properly shielded to meet an Air Force requirement for double or triple-redundant wiring for some mission systems. In September 2014, it was confirmed that the wiring redesign would delay the first 767-2C flight from June 2014 to November 2014.
[54][55] The 767-2C's first flight took place on 28 December 2014; it flew from
Paine Field and landed at
Boeing Field