(a) You can appeal to the MSPB a decision that affects your rights and interests under this part, except an OPM decision under subpart L (see §839.1303). Some examples of decisions are:   (1) Your employer's determination that your error is not subject to these rules;   (2) Your employer's determination that you are not eligible to elect retirement coverage under these rules; and   (3) OPM's denial of your request for a waiver of the time limit for making an election.

(b) You may not seek review of a decision under any employee grievance procedures, including those established by chapter 71 of title 5, United States Code, and 5 CFR part 771.