My mini drama over the last 24hrs.
Took car to garage to have 4pots installed and new rotors. Picked up at end of day Friday. Looks good.
Drove <1km home. Brakes a little soft but ok. Inspect new brake/rotor look at home. Notice brake fluid in wheel arch and over tyre.
Investigate further, brake fluid all over inside of passenger side wheel.
Massive leak from hose to caliper connection. Looks like washer wasn't reinstalled. Its still on the old caliper.
Too late to take back to garage and closed for the weekend.
Custom 4pots paint ruined. New rotor (with black painted centre) ruined.
Try to take wheel off. Nuts on too tight as garage used impact gun. Break torque wrench (I know, wrong tool) trying to loosen.
Scissor jack then seizes with car off the ground.
Its been one of those weekends.
.. garage and I will be having interesting phone call on Monday.
Further information that may assist others.
Some McIntosh Head Unit version and the US and Australian NAVI Service Manual's are on the Internet - searches Clarion PF-2551l pdf (A and B versions found) and Kenwood FGZ000MF2 and FGZ203MF2 pdf for the Navi screens. The 7" navi screen definition FWIW is 234x400 pixels. How to enter Test and manufacturing modes is shown.
Feeding the McIntosh EF-1208l amplifier Power On 12V line with a 470 ohm 0.5 W resister may be a prudent safety step as they seem to do to turn the amp on. Delaying turning this on signal may be a useful dethump opportunity for anyone so effected.