He lost his wudoo’ whilst doing the prostration of forgetfulness (sujood al-sahw); what should he do?

What should one do if one makes a mistake (such as forgetting to
recite Rabbigfirli between the two sajdas) in Sajdah Sahw ? Also what
should one do if ones wudhu gets lost during the SajsahSahw (such as
when sitting between the two sajsas)?.
Praise be to Allaah.
Firstly:
What is prescribed in the prostration of forgetfulness is to say in
itand between the two prostrations what one says in prostration during
prayer, so you should say tasbeeh whilst prostratingand say Rabb
ighfir li (Lord forgive me) between the two prostrations. But if you
forget any of that, you do not have to do another prostration for
forgetfulness, so that it does not become an endless cycle.
It says in al-Sharh al-Kabeer (1/700) about matters for which no
prostration is required: It is not prescribed to do theprostration of
forgetfulness in the funeral prayer, because there is no prostration
in this prayer, so how could you do a prostration to make up for a
mistake in this case; or in the prostration of recitation, or in the
prostration of forgetfulness. This was stated by Ahmad. And because
there is consensus narrated by Ishaaq, because it would become an
endless cycle. So if he forgets somethingafter doing the prostration
of forgetfulness, he should not prostrate again for that reason. And
Allah knows best. End quote.
It says something similar in Mataalib Ooli al-Nuha (1/507).
To sum up: if a person forgets something during the prostration of
forgetfulness, he does nothave to do anything else, and his prayer is
valid.
Secondly:
If a person loses his wudoo' during the prostration of forgetfulness,
the matter is subject to further discussion:
1. If he prostrated before the salaam, his prayer is rendered
invalid,because saying the tasleem at the end of the prayer is a
pillar or essential part of prayer, and he broke his wudoo' before
doing this essentialpart.
2. If he had said the salaam at the end of his prayer, and he only
had the prostration of forgetfulness to do, then he lost his wudoo
during it or before he did it, then his prayer is valid and he does
not have to do anything else, because theprostration is making up for
a mistake in the prayer, and it is not rendered invalid by missing it.
It says in Kashshaaf al-Qinaa' (1/409): If a person forgets the
prostration of forgetfulness until he starts another prayer, then he
remembers it, he should make it up when he says the salaam, if a long
time has not passed. But if a long time has passed, he should not do
this prostration, because it is done to complete a prayer, so it
should not bedone after a long time haspassed. Or if he has left the
masjid he does not have to do this prostration; and the sameapplies if
he loses his wudoo' -- and his prayer is valid.
And Allah knows best.