what are RE* PTF numbers

When I do a DSPPTF for one of my systems the first page (for 5722999) shows these numbers I don't recognize:

Display PTF Status
Product ID . . . . . . . . . . . . . : 5722999
IPL source . . . . . . . . . . . . . : ##MACH#B
Release of base option . . . . . . . : V5R2M0 L00
PTF IPL
Opt ID Status Action
RE05137 Permanently applied None
RE04195 Permanently applied None
RE04112 Permanently applied None
RE04089 Superseded None
RE03212 Permanently applied None
RE03194 Permanently applied None
RE03098 Permanently applied None
RE02343 Permanently applied None
RE02310 Permanently applied None


The other LPAR looks like I expect:

Product ID . . . . . . . . . . . . . : 5722999
IPL source . . . . . . . . . . . . . : ##MACH#B
Release of base option . . . . . . . : V5R2M0 L00
PTF IPL
Opt ID Status Action
TL05263 Temporarily applied None
TL05123 Permanently applied None
TL04244 Permanently applied None
TL04077 Superseded None
TL03364 Superseded None
TL03252 Superseded None
TL03161 Superseded None
TL03077 Superseded None

I have never seen PTF numbers like this. A Google search comes up empty.

Scott Lindstrom