GE 7-2990A Shortwave Receiver removing the main circuit board

Has anyone had experience in removing the main circuit board on this receiver (GE 7-2990A)? I have to remove the board in order to replace the audio output jack. There are no instructions (disassembly) in the current service manual for this receiver. Note that this board must be removed and turned so you can make the receiver alignments. when you remove the back cover of the receiver, you are looking at the BOTTOM of the main board and the adjustments are on the opposite sides. The closest relative to this receiver is the DR-26 and the RF-2600C Pansonic, but they only have slight similarities in the mechanical and electronic areas. Any info will be appreciated.