I have an 18 month old Canon EOS 70D. This morning it was working fine while alternating between Manual and AV modes when it malfunctioned. Now the exposure meter needle, when in any mode other than Manual or Fully Automatic, is fully to the right hand side. All images are totally over-exposed regardless of aperture, shutter speed or ISO settings. Is there something I have set incorrectly, or must I send it in for repair. I think I have a two year warranty, but not certain of this.