MDM Trouble Report for 2003 Sep 7 Telescope: 2.4m Observer(s): Patrick Cseresnjes & Alex Bergier (Columbia University) Instrument: 8K Camera Problem(s) Encountered: The mirror covers do not open in spite of our best efforts and following the procedures described in the manuals: 1) We attempted to release the covers, after tilting the telescope, with the help of a rod. We were able to release one of the covers; however, it returned to its original position upon pointing the telescope towards the zenith. 2) We repeatedly moved the position valve on the control box (located in the SW corner of the dome) from 'Compressor' to 'Cylinder' for a short period of time (a few seconds), with no effect whatsoever. Please note that a shutdown was performed the previous morning and we are unsure whether our problem might be related to it. ------------------------------ Submitted on 2003 Sep 8 [1:00:10]