(a)
Any employee—
(1)
who ceases to be entitled to the benefits of section
5362 of this title by reason of the expiration of the 2-year period of coverage provided under such section;
(2)
who is in a position subject to this subchapter and who is subject to a reduction or termination of a special rate of pay established under section
5305 of this title (or corresponding prior provision of this title);
(3)
who is in a position subject to this subchapter and who (but for this section) would be subject to a reduction in pay under circumstances prescribed by the Office of Personnel Management by regulation to warrant the application of this section; or
(4)
who is in a position subject to this subchapter and who is subject to a reduction or termination of a rate of pay established under subchapter IX of chapter 53;
is entitled to a rate of basic pay in accordance with regulations prescribed by the Office of Personnel Management in conformity with the provisions of this section.