Panasonic PV-DF273 service mode

Anyone know the secret to this one? Set all fixed, but grey scale needs set on this 1 yr old 27"/DVD/VCR. It will take a month to special order the service manual for this model. I hate to take a month just for a simple adjustment. Shop is full of HDTV, etc. All take a month to get the stinkin manual! Please any ideas that may work to enter the service mode. Already tried the Stop/FF/Vol down buttons that was the way to do it on some prior Panasonic combo units. Ron Hansen Wheat Ridge TV, CO