[greg.s.young]

found a post with details on the faulty OLED displays – obviously mine
fell into this category!

for completeness to close this post
The replacement OLED display for OS 3.0 AC appears to be:

OLED Display 0.96” IIC (I2C) 128×64 resolution, also sometimes referred to as “SSD1306” .
( which is actually the I2C driver chip used in the display electronics)

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