I found the following procedure posted by Taejin Park on Vector Board's Peugeot Car Pages on 23 October 2000 (thanks TJ!). If you have been putting off changing the bulb behind the digital clock in your 1986 or later (Series II) Peugeot 505 GTi sedan or wagon; because the Haynes workshop manual gives the impression you have to remove the whole centre console to do it; then read on. Steps are as follows:
(When I finally sold my 1991 505 Wagon in December 2011 the lamps were still working well).
Simon Nix
23 August 2001