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During the 1970s BR introduced the [[TOPS codes|TOPS numbering system]]. This required unique identifying numbers for all assets. To avoid potential conflicts, wholesale renumbering of certain ranges of coach numbers was carried out, including CKs numbered 15xxx and 16xxx which became 7xxx.<ref>[[Bibliography#Other References|Longworth (2013)]] p.9.</ref> The coach therefore became number M7169. It was subsequently reallocated to the Scottish region in January 1986.<ref>[[Bibliography#Other References|Longworth (2013)]] p.80.</ref>
7169 underwent its last works overhaul in January 1986. After running a further 59,595 miles on cross-country services., it was withdrawn from active service on 2 December 1988 at Heaton, Newcastle<ref name=SVR92>SVR News 92</ref><ref name=Stockbook/>.
==16169 in preservation==
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By early 2017 the decision had been made that 16169 needed to be returned to service so that identical [[BR 16267 Composite Corridor|16267]] (which had 'borrowed' 16169's seats some years earlier) could be retired for major welding repairs and new doors. Work therefore began on overhauling 16267's old seats for use in 16169. In March 2017 16169 was moved outside [[Carriage Repair Works|Kidderminster Carriage Works]], initially for welding repairs, with other jobs both internal and external continuing as events permitted.<ref>SVR News 200, Winter 2017</ref> Spring 2018 saw it outside the [[Carriage Repair Works|Kidderminster paintshop]] after work to make it waterproof with a newly painted roof. In September 2019 it was in the paint shop receiving further repairs before proper painting could begin, which was completed by November 2019. After a delay awaiting time on the jacks, 16169 was moved onto accommodation bogies in March 2020 to allow its commonwealth bogies to be worked on<ref>SVR News 210, [https://forum.svr-online.org.uk/viewtopic.php?t=3461&postdays=0&postorder=asc&start=60 'Kidderminster Carriage Works update, 'SVR Online Forum]</ref><ref>[https://www.svrlive.com/blsep20 Branch Lines newsletter, September 2020] (Retrieved 29 August 2020)</ref>. Further delays due to the second Covid [[2020 coronavirus disease (COVID-19) pandemic|COVID-19]] lockdowns meant that plans to return 16169 to service in time for the 2020 '[[Christmas services|Steam in Lights]]' could not be met, with the coach finally being shunted out of the carriage works for test running on 11 January 2021.<ref>SVR News 213</ref>
16169 returned to service in spring 2021, although a few weeks later it was briefly withdrawn again after an issue was found with the dynamo 'motoring' (being driven by the batteries, rather than putting power into them, as the result of a wiring fault). This was resolved by replacing all the heavy-duty cables from the dynamo to the regulator and battery box, with 16169 returning to duty in [[Carriages#The_carriage_sets|Set M]]<ref>SVR News 215</ref>.
