Thanks for the input and help.
I will do more measurements today after work.
The PCB behind the keyboard is all broken to pieces, the Erase key broke off somehow
didn't find it inside the scope. But yeah it is a shitty weak PCB. The pots seem to be okay but the shaft is bent. Will do some bodging today
I hope it's only the CRT that's causing problems, before I replaced the caps the scope was working and some buttons too.
Power switch bar is broken but I did find the broken bit in the pouch so I can glue that one.
Mainboard and PSU look okay visually, didn't see any obvious problems.
The crt cathode pcb had some oxidised resistors but when I measured them they had good resistance so I didn't want to start replacing them yet until the caps would prove to fix the squished screen issue.
More pictures to follow.
Cheers