With the pre-amp *on and the power-amp *off cycle through that contour selection couple dozen times and turn on the power-amp and see if it's changed anything.
From Rotel.com the following on your 12v triggers....
[To use the 12 volt triggers on the RA 1070 requires a 3.5mm Mono to Mono cable, which is not included with the unit but can be purchased from any local electronics supply store, such as Radio Shack. The 12V trigger current output of the RA 1070 is 15mA. Some other manufacturerÂ’s components do require more current than this to use their triggers, however. In such cases, using a Xantech AC-1 12V Trigger to switched AC outlet may be useful.]
From Rotel.com the following on your 12v triggers....
[To use the 12 volt triggers on the RA 1070 requires a 3.5mm Mono to Mono cable, which is not included with the unit but can be purchased from any local electronics supply store, such as Radio Shack. The 12V trigger current output of the RA 1070 is 15mA. Some other manufacturerÂ’s components do require more current than this to use their triggers, however. In such cases, using a Xantech AC-1 12V Trigger to switched AC outlet may be useful.]