[TenTec] Omni VI+ 100 hz off exactly on readout

[John King]

My 25 year old Omni VI+  has gradually crept up 100 hz on the readout. I have a new TCXO that I recently purchased but I would like to make an adjustment to bring the BEAUTY UP 100hz so it will read 3.925 instead of 3.924.9 when it is in fact receiving on 3.925.
I have NEVER adjusted any adjustments on any of the boards and have No idea  where the appropriate adjustments are located on the appropriate boards. I have the manual that came with the Omni VI from Ten Tec but need some direction to physically locate the appropriate trimmer to move it up 100hz.
If you can assist me by helping me locate the appropriate board and specific adjustment to raise the freq 100 hz it will be greatly appreciated. Thanks and 73, John, K5PGW