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A while ago I ended up with a broken board from a Spanish Spectrum+ 128K. The first obvious issue from outside is that the large heatsink which give the 'toastrack' it's nickname is missing.
missing the M1 line) I also added a heatsink to the ULA.
ZX Spectrum Diagnsotics V0.33, it didn't detect the Spanish ROM, it's CRC may not be in the table, but all the other diagnostics tests passed
I ran this on a soak test for a while with only the ULA getting warm, so I fitted that with a heatsink. The board seems to be running OK, I didn't have the original case, so I just had the board.