OK, realize I am not a vet but have a lot of experience raising dogs that tend to have weird problems. I tend to study the problems I have thoroughly but I know I have 'blinders' when it comes to general canine health. I also have a small library of vet school texts and my current elderly dog has liver issues so fwiw,.....
My texts show the range of normal levels of blood work enzymes/antigens as follows (slight variations from these ranges can be normal, depending on the individual dog's blood chemistry):
WBC 5.5 - 16.9
Eos .1 - 1.9
ALKP 23 - 212 (I think this is your ALP)
ALT 10 - 100
AST 5 - 55
Creatine .5 - 1.8
T4 (thyroid) 1 - 4
Tbil 0 - .9
BUN 7 - 27
The ectoparasites probably have no relation to the cause of your problems. This could be anything from the mange to fleas to skin allergies.
If I am seeing the decimal places correctly on your picture, some of these values, particularly liver enzymes are way off. Definitely grounds for a recheck and/or 2nd opinion. And probably further investigation.
As I see it, the ALT and AST values are very high; I am confused by the wide range of the 2 readings of ALP. All of these are liver enzymes and are worrisome. It may just be a transient thing like your dog consuming something toxic that the liver is processing out of his system, but you do need to watch it closely and follow up to rule out an ongoing problem that is causing the liver to pump out those enzymes.
This link defines some of the enzymes pretty succinctly:
AST | Canine Liver Disease Foundation
My thoughts and prayers are with you on this. The liver acting up is scary scary territory. If I can help, please don't hesitate to ask. I'm one of the Nutty Dog Lover crowd.
eta: oh, and a pricey drug called Denamarin can be a miracle worker to restore liver function. Ask about it if your problem goes that route.