After checking over the car, one of the calipers had indeed seized and majorly overheated causing terminal issues to the non-stock caliper.
It was decided and more cost effecitve to replace the caliper with a new one rather than rebuild it. He decided to replace both front calipers “just in case”.
While I was there the auto transmission pan gasket was also replaced as this was a source of leakage.
Three hours later, all done and completed.
July 25th 2021