Please see the link below for an explanation of protect mode. After that, please post here any additional questions that you have. Specific to your model, you can expect a parts cost in the $40-$60 range for the repair.
Dan
Link: http://www.fixya.com/support/r5390728-protector_means
SOURCE: i have a sony str-de335 fm stereo receiver and
This can be shorted output transistors (common) or a defective voltage amplifier IC. WIthout taking measurements inside, there is no way for me to make that determination. In any case, this should be a relatively simple repair for a shop that repairs audio gear. Expect a parts cost in the $25-$40 range.
Dan
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