CommonwealthProAudio.com
Here's a Pro Junior with a busted input jack. It turns out all the tubes were bad and the pots were also dirty.
There were two separate gunks on the amp - WD40 and probably beer.

0:30 - Initial Test
1:12 - Closer View of Broken Jack
3:45 - Testing the Tubes
7:15 - Ohming out the Speaker
7:35 - Killing a Spider
7:45 - Draining the Caps for Safety
8:00 - Resoldering Tube Sockets
10:10 - Dropping the Main Board
12:54 - Closer View of Pot and Jack Connections
13:00 - Resoldering Pots
13:43 - Removing Broken Jack
14:15 - Cleaning the Pots
15:40 - Inserting New Tubes
16:15 - Tip for Opening Groove Tubes Preamp Boxes
17:00 - Installing New Jack
17:49 - Cleaning Pots Again
18:03 - Reinstalling Main PCB
19:35 - Testing Through Light Bulb Limiter
20:30 - Testing With Audio/Guitar
21:20 - Testing at Full Power
22:10 - Reinstalling Baffle
22:53 - Final Test Follow Andy on Spotify:
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