The unreliability of the aging Optus B1 satellite was highlighted when the DBS service went offline just before 7 p.m. NZST (8 a.m. London, 3 a.m. New York) on 30 March 2006. The interruption affected service to over 550,000 customers and caused many decoders to advise customers of "rain fade." Due to excessive volume of calls to the Sky toll-free help-desk, Sky posted update messages on their website advising customers that they were working with Optus to restore service by midnight. Sky credited customers with one day's subscription fees as compensation for the downtime at a cost to the company of NZ$1.5 million. Sky switched its DBS service to the Optus D1 satellite on 15 November 2006. It later expanded its transponder capacity on this satellite to allow for extra channels and HD broadcasts.