Sorry, don't know any more about the test, but
www.airlinerlist.com is a great resource for finding the details of such things as dates of first flight, reg. changes etc.
For 1085, it says:
First flight 14 July 1974
Delivered to Eastern 17 October 1974
Stored at Miami and sold to MNBD 18 March 1991
Re-registered to D-AERC 17 July 1991
Into service with LTU 21 July 1991 on a 13 month lease
Retired 6 November 1992, total time/cycles 40032/19517
Stored at Mobile until at least April 1994
Re-registered to N329SN (owner NoRC)? February 1997
Broken up 1997 (ex CoB)?
I assume the testing took place just before this, but despite having so much info on everything else, it doesn't say. I'm surprised it still had the german markings having been retired for 5 years by this time.