As noted in the image below, a "red" power light simply means one (or more) of the listed settings is enabled.
If a microprocessor reset (ie. pressing/holding the "Tuner Preset +" and "Tuner Preset -" buttons on the front panel for 5 seconds) while pressing and releasing the "Power" button does not result in "Initialized" displaying on the front panel after the 5 seconds, then try just pressing/holding the "Power" button for 5 seconds, If still no joy, then time to upgrade to a more current model that is on clearance (eg. 2019 model).
If a microprocessor reset (ie. pressing/holding the "Tuner Preset +" and "Tuner Preset -" buttons on the front panel for 5 seconds) while pressing and releasing the "Power" button does not result in "Initialized" displaying on the front panel after the 5 seconds, then try just pressing/holding the "Power" button for 5 seconds, If still no joy, then time to upgrade to a more current model that is on clearance (eg. 2019 model).