As far as I know a common problem of Agilent meters. I was in doubt back then if I would buy an oled or LCD version. I bought the LCD. After many years the stand was dead, the display scratched and it looked worn. A friend gave me one with a worn Oled ( U1254) and I used the cabinet for my Agilent U1253, now it looks like new again.
It is a shame for a meter at this price, these displays wear this fast.