As business manager for Qfix Truck Service I was personally involved in this claim.
Jessica's statement are incorrect. We were not allowed to remove drain plug (front one of four on a CAT motor). She stated we over torqued but were never allowed to loosen. Her reasoning was "we would stretch treads" and it would cause it to leak. We never got the opportunity to prove her claim. Typical issue on aluminum pan on CAT motor is for plug to stick. Not freeze.
We have several witnesses (including truck driver she mentoned) who claim she was the instigator of all the hostility. Our Assistant manager on duty at the time (Sam Anderson) was very professional about asking Jessica to leave but eventually had to "threaten" the law and close our garage doors to keep Jessica from disrupting other business at the time.
The other PM provider by the way was her. Learned this from her co workers that stated she had come into fleets garage seeking assistance.