R & downgrades HEI.GR Key Research: Citi cuts Bank estimates & downgrades Energy Sector & upgrades Telecom Sector Key Research: Citi downgrades AJG/BRO/WSH & reiterates MMC/AON (buys), JPM upgrades CLH Key Research: Citi initiates ADS.GR (buy) & upgrades Transports & Household Personal Products, Piper downgrades DGIT Key