An Obvious RAM Fault? Toastrack Repair with Suspect Ram

A Sinclair ZX Spectrum 128k "Toastrack" has a suspiciously familiar looking fault. Sent to me by Paul Universal Retro Boss my immediate thought is the ram is faulty. Normally this leads to the conclusion that something else entirely different is wrong! But this time I might just be right!
Fixing stuff is FUN!

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