CPH runway
 

Am I reading this right?

Up until yesterday mid-day, friction coefficients of about 0.6.

EKCH 201220Z 04008KT 9999 FEW048 SCT250 03/M05 Q1003 04710161 54710159 12710163 NOSIG=

After that, consistently friction coefficients of 0.05.

EKCH 210420Z 17020KT 9000 -RA BKN008 03/01 Q0975 04////05 54////05 12////05 TEMPO 4000 BKN010=

Problems with the automation, perhaps?

The Obliques indicate 'clearance in progress' so not sure why any braking action reported until complete, like you say probably automatics. How long did this persist for?

Checking it out, it appears to be from

EKCH 201250Z 05006KT 020V080 9999 FEW046 SCT250 04/M04 Q1003 04////05 54////05 12////05 NOSIG=

all the way through to

EKCH 210420Z 17020KT 9000 -RA BKN008 03/01 Q0975 04////05 54////05 12////05 TEMPO 4000 BKN010=

Clearly something in an automated chain has broken, and the default entry is not a good one. Must have caused a little alarm for dispatcher, though!