Strangely enough I proposed the tape over static port scenario in post 109 (
http://www.pprune.org/rumours-news/3...ml#post4561998)
What happens is the sea level pressure bleeds out in climb, and then the statis pressure stays low giving an artificially high indicated airspeed when the aircraft descends. The delta pressure across the tape seals the 'low pressure' in. Airbus aircraft do not have pitot-static probes, they have pitot probes with separate static ports on the fuselage.
If the MRO uses aluminium speed tape to cover the static ports, it is easy to miss as it is the same colour and appearance. Hence reputable MROs use bright orange covers with a streamer.