OKIDATA OL830 Laser Jet Printer - ERROR ENGINE FAN PROBLEM

Just a follow-up since hopefully everyone was busy over the weekend and did not see my appeal for HELP!!!! To be more specific: OKIDATA OL830 LED PAGE PRINTER Model No. EN257OHA When the power is applied, after a few seconds the front LED shows: "INITIALIZING" followed a few seconds later by the error message: ERROR ENGINE FAN PROBLEM At that point, the SERVICE LED turns red. Otherwise, everything else looks and sounds normal. I have managed to remove the top plastic portion of the case (two bolts at the front). Of course, when the power is applied in this case, the error is "COVER OPEN". The fan at the back rear on the left is free spinning, but is seems doubtful that is the problem. Had anyone the knowledge as to what might be wrong and how it can be fixed? Sincerely yours, Jerome Fine -- To obtain the original e-mail address, please remove the ten characters which immediately follow the 'at'. If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.