Sorry, no videos, old skool.
First do not power on the amp unless an AK member tells you.
Hopefully you will have a multimeter, it should have a diode test function, look for the diode symbol.
You should have the CA-800 service manual, suggest download the CA-1000 service manual, it's better quality and very similiar.
Diode check
TR606,7
D601
TR608,609,610,611
using the graphic in post 32, the RED/BLACK refer to multimeter probe orientation.
Two results are expected, either 650mV(550-750mV or so...) and OL/Open Circuit.
You will need to download the transistor datasheet to identify the pins emitter/collector/base, many tools, try this one
http://www.alldatasheet.com/
Also, you will doing the test with the transistors still in circuit, this is not preferred but for a first attempt we will try.