That's completely wrong.
1) Repairing old equipment is not so difficult providing you know what you are doing... and
2) The OP has little chance of sending a 1948 piece of gear back to the probably long gone out of business company!
Electrolytic caps will probably all need replacing
All switch contacts cleaned
Check insulation of all cabling and rewire where necessary.
Check all valve fils light up
Good luck...
Daniel (VK2FERN)... Chartered Elec/Electr Engineer and former tech with 1000's of hours bench time...