I hope I am not raining on someone's parade, but according to several local correspondents "Guppy" has NOT moved under her own power since 2003...
Several engine tests were performed last autumn prior to the closure of BASCO, but it seems no work at all was done on her after Friday the 22nd of December 2006, the day BASCO went out of business...
After this date she was parked outside in full view of any passer-by. A mechanic working on her would surely be noticed...