This ZX Spectrum 128k +2 Grey belongs to Paul Universal Retro Boss. The symptoms are black screen. I made a big mistake in the diagnosis that I really should have checked earlier, but was led astray by the thermal camera pointing to a glowing chip.
128k Plus2 Service Manual:
https://www.theoldrobots.com/book74/ZXSpectrum128+2_ServiceManual.pdf
Spectrum Video Mods by @RetroComputerShack
https://www.retrocomputershack.com/RCS-Website/Tech-Info-Home-Page/index.html
ZX Spectrum +2 Grey Corrections guide by Adam's Vintage Computer Restorations
https://retrorepairsandrefurbs.com/2021/07/07/sinclair-zx-spectrum-128k2-grey-restoration/
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