Service for toilet clogged. Inspected toilet and determined that the toilet fill valve was not working properly and required replacement. Toilet was found to be flushing normal; but advised customer that since it was filling so slowly, that multiple uses back to back would create a flush with lower than required water volume. Customer also complained of low water pressure throughout the home. Checked the pressure reducing valve (PRV) and determined that it was not operational. Suggested that this PRV also be replaced. Customer accepted estimate for replacement of toilet supply valve and PRV. Toilet supply valve was replaced and checked for leaks. Contacted office; and will need to return to replace PRV.