The same segment is missing on every digit across the top display; the other displays are fine, and the fault followed the display into another game.

Same segment missing on every digit of one display: loose glass lead

Cause: A lead of the display glass had been repaired before and had come loose from the board, so that segment line had no drive.

Checks

• Find which segment it is in the manual's chart and trace it to its driver chip and resistor on the display board.
• Reflow the glass leads and header pins and look for any lead that moves.

Fix

• Carefully re-solder the loose glass lead to the board.

Display boards carry high voltage for the glass; unplug the game before handling them.

Systems

• Williams System 11B

Games

• Taxi

Related tips

• Banzai Run display board traces delaminate
• Using a Taxi/Police Force display board in another 16-digit game
• Same character position dead on every display: digit strobe wire at MPU J2
• Taxi and Police Force display board differences
• Same segment missing across one 16-digit display
• Segment missing or stuck only on certain characters
• Check every segment with the display test
• Score display layouts across System 11

Source: Pinball Repair help group!! (Facebook group)