hi mate.
the pro 7 has appeared in posts on a few occasions on here with various problems, I even think Ionics have stopped making them now.
Darren from purple rhino may be able to help you as I think he was the last person Ive seen on here who had one.
you could try some of these contacts for his company as I feel he may be the best person to help you.
Purple Rhino Window Cleaning
Local & National Services
Head Office 01342 716137
Crawley 01293 769934
Haywards Heath 01444 318659
Mobile 07766 243 171
Email
info@purple-rhino.co.uksteve