Davydenko then saved a set point before coming from 0-30 down in his next service game to take the set into a tie-break.
Broady and Farquharson had three breakback points in Burton's next service game and took the second to level the set at 3-3 and Morgan saved two break points in his next service game with two big serves.
Gulbis then fashioned a break-point chance in game 10, only for Murray to respond with a service winner of his own.
"Closing all face-to-face tax offices would break the link between people in communities and an essential public service they rely on, " said general secretary Mark Serwotka.
With service dictating, the Canadian and Serbian looked in trouble in the tie-break before edging the first set.
He had to save a break point in his opening service game and it came as little surprise when he was broken at 1-2, completing a disastrous game with a double fault.
One of the Internet Protocol (IP) addresses used to break into Nonghyup's system was the same as one used in March for a distributed denial-of-service (DDoS) attack that originated in North Korea, they added.
Murray seemed rejuvenated from his three-week break as his service game was almost flawless, with the British number one dropping just one point in the first set.
Murray and Kohlschreiber had never met before but the world number four soon asserted himself by grabbing a break of serve in just the fourth game before winning his next service to love and race into a 4-1 lead.
Emily Adams, who helps care for her 18-year-old grandson Duke in east London, said her local council does not offer any form of short break service.
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