For the book keeping purpose, here is a list of the log entries that describe the history the old Prometheus (2143A).

• Feb. 6th 2018 (4124); 2143A was installed on the POP table in order to test out TMSY. At this point no issue was found with 2143A
• Aug. 6th 2018 (5724); the installation of the ALS optics in the PSL enclosure began.
• Aug. 8th 2018 (5758); 2143A was moved from the POP table to the PSL table.
• Aug.9th 2018 (5772); the issue was spotted for the first time.
• Aug.11th 2018 (5786); the issue developed.
• Aug.13th 2018 (5798); the situation momentarily improved.
• Aug - Dec. 2018 (no logs); the laser was left off. Sometimes we switched it on, but it did't run for hours.