Fixing a completely dead Marshall Stanmore Bluetooth speaker

Something unusually young on my workbench: this Marshall Stanmore Bluetooth speaker from 2014 is completely dead. In this video I'm going to rebuild the problematic section of the power supply.

I found 3 forum threads in total discussing several technical issues and repairs related to this device:

1) Badcaps.net (English): https://www.badcaps.net/forum/trouble...
2) Mikrocontroller.net (German): https://www.mikrocontroller.net/topic...
3) Retrotechnique.org (French): https://forum.retrotechnique.org/t/pb...

The hand drawn schematic shown in the video can be found over here: https://www.mikrocontroller.net/attac...

List of components I replaced:

Q7 (original: FDPF10N60NZ, replacement: STFU10NK60Z)
U1: OB2269
ZD3: zener diode, original value unknown but replaced by 3x 8.2V in series
R96: 10k
C4: 3.3µF / 50V
C49: 100µF / 63V
C82: 22µF / 50V

WARNING: Do not attempt to repair electronic equipment if you don't know what you're doing.

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Music by Karl Casey @ White Bat Audio
Noise video footage by Milan Matos
Electrocution logo by Nesdon Booth, The Noun Project