That's the problem with LAWO (Land Illuminator Europa) EDS these
days, 637X and 638T's main/side EDS seems spoilt, and I
remember seeing TIB 510 C's showing 857 and off service.
Should have changed all LLE's EDS to either mobitec or
LAWO-SICMA though. Much clearer.
I've seen '85FF SERVICE' on TIB938C(852) wonder if any of the
mobitec or new LAWOs have this problem