Perkin-Elmer's schedules continued to slip at a rate of about one month per quarter, and at times delays reached one day for each day of work.. 
In addition, the relations arrays and their drive elerẹ̀ were replaced, as well as four of the oṣóscopes used in the telescope pointing system, two electrical control units and other electrical trivineníláti, and two Magking5BFR.. 