I've done a few things with the Whoopee now:
More purchases
First, after transporting it from the warehouse to my home a couple weeks after the purchase, I bought the machine's flyer on eBay, as well as complete sets of rubbers, light bulbs (#47, I don't want the plastics to suffer anymore), a used shooter rod, 5 bumper scoring NC switches (many thanks to the guys at PinballHQ for helping me identifying them; they were all broken, and I wanted to have spare), standard 1 1/16" balls, and backglass connectors (which were broken too, as you can see on the pictures).
Cleaning
I also setup to remove almost everything from the playfield (except the bumpers and captive ball rails), and then began to clean the playfield. I've used St Marc detergent heavily diluted to begin with the bulk of the dirt. I've removed the pencil mark using 90° alcohol and a Q-tip.
The topmost Jet bumpers are definitely broken, I will have to replace them.
The pictures are here:
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