Investigation report is now available.
http://www.bfu-web.de/berichte/04_ex001eub.pdf
Although it had been snowing most of the day, runway cleaning and clearing concluded 1 hour before the DC-10 landed. Chemical de-icing agent had been applied to the runway. The runway was partly covered with snow and slush. There were no documents on board to calculate landing distance with a contaminated runway, however the landing distance required was available but only if reverse thrust on all engines was used. The #1 reverser jammed after touchdown and was unavailable as breking support. The #3 reverser could not be used fully because of asymmetric considerations.