Apple Macintosh SE Repair - Too many faults to win!

I've acquired this beautiful Macintosh SE and it's in need of help.

Will I be able to make it work?

Part 2:    • Apple Macintosh SE repair - ADB heada...  
Part 3:    • 100% Fixed Apple Macintosh SE  

Floppy cleaning video:
   • How to Fix Your Macintosh Floppy Drive  

I then found one from ‪@adriansdigitalbasement‬ as well:
   • Tutorial: Cleaning, lubricating and f...  

00:00 intro
00:55 inspection
02:30 Power supply inspection and test
05:37 Power up!
06:25 Voltage test
07:12 Troubleshooting the error
08:02 CRT issue
09:00 RAM troubleshooting
13:10 Power up 2!
15:10 Power up 3!
17:14 Floppy troubleshooting
24:00 Mouse has escaled the cage!
25:26 ADB troubleshooting
29:27 ADB + Oscilloscope!
31:53 Cracking the ADB code!
37:31 BBU inspection
37:57 Final test
38:03 Conclusion