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Beginning stages of renal failure may be asymptomatic - means you may not feel anything abnormal. Other signs could be frothing in the urine, less urine volume than before, swelling in the feet and face.
You may also experience loss of appetite , nausea and itchy skin.
Best way to diagnose it is a simple blood test to check creatinine levels.
Light brown urine may not be significant unless you suspect it to be blood.
If you have any more questions, please let me know.
Blood in urine means Urine mixed with blood. Red colored urine usually is due to bleeding in urine.