'The Red Fault Lamp', William Plomer
An Apollo mission poem (the Apollo 11 mission forms the background to 'Bikes', below).  This is more of an oddity than anything in Bowie's song. I don't know if it's in Plomer's Collected Poems. I found it in London Magazine: 25 Years, 1961-1985, edited by Alan Ross: a wonderful miscellany of contributors including Auden, Larkin, Nadine Gordimer, William Trevor and Keith Vaughan. Plomer's poem is in his handwriting.
The red fault lamp
in the zero reset push-button
is lit on one axis, look,
and it still stays lit
after fault setting, after checking
it still stays lit:
where do we go from here?

Another thing I don't know
is where should the x and y
oscilloscope input leads be connected
if a check is needed
of the optics signal waveform?
Look at the red fault lamp,
it still stays lit.

Somewhere something is wrong,
as it usually is;
after checking, after re-setting
who would ever have thought
the mean little red fault lamp
would still stay lit?
My third question: no answer.

From back there no answer,
nor likely to be now we're this far out
with the moon small as a nut.
I knew a girl went through life
as born, with only one tit,
and here we are, three nuts in space
with our red fault lamp still lit.