Hi Dave,
The two SUBMERGED torpedo mounts originally fitted when built circa 1916, were replaced by two quadruple, deck mounted torpedo tubes in the refit of 1938/39.
From wiki (note the last sentence):-
Renown began a much more thorough reconstruction in September 1936, based on that of the battleship HMS Warspite. Her superstructure and funnels were razed to the level of the upper deck, her masts taken out and the ship's main and secondary armament was removed. A large splinter-proof tower superstructure was built, topped with a director-control tower for the main armament and two HACS Mark IV directors. The armoured hood formerly mounted above the conning tower was reinstalled on the rear superstructure. The ship's engines and boilers were replaced by Parsons geared turbines and eight Admiralty three-drum boilers operating at 400 psi (2,758 kPa; 28 kgf/cm2).[25] This saved some 2,800 long tons (2,800 t) of weight and allowed the two forward boiler rooms to be converted to 4.5-inch (110 mm) magazines and other uses. Renown's deck protection was somewhat upgraded by adding non-cemented armour where it had not been added earlier and protecting the new 4.5-inch magazines. As in Repulse hangars were built abreast her rear funnel and a catapult was fitted between the rear funnel and the aft superstructure.[26]
Renown, as reconstructed, in 1939
The ship's 15-inch gun turrets were modified to the Mark I (N) standard with their elevation increased to 30°. Twenty dual-purpose QF 4.5-inch Mark III guns in twin BD Mark II mountings replaced all of the 4-inch guns. Six of the gun turrets, three on each side, were abreast the forward funnel while the remaining four were mounted abreast the main mast.[22] The BD Mark II mounts had elevation limits of −5° to +80°. The Mark III gun fired a 55-pound (25 kg) high explosive shell at a new gun muzzle velocity of 2,457 ft/s (749 m/s).[27] Its rate of fire was 12 rounds per minute. They had a maximum effective ceiling of 41,000 ft (12,000 m).[28] The guns were controlled by four dual-purpose Mark IV directors, two mounted on the rear of the bridge structure and the remaining two on the aft superstructure. They fed tracking data to a HACS Mark IV analog computer for high-angle targets and an Admiralty Fire Control Clock Mark VII for low-angle targets.[22] Each gun was provided with 400 rounds of ammunition.[29] Three octuple Mark VI 2-pounder mounts were fitted, two on a platform between the funnels and the third at the rear of the aft superstructure. Each was provided with a Mark III* director. Four quadruple Vickers .50-calibre Mark III mounts were also added, two each on the forward and rear superstructures. The submerged torpedo tubes were removed and eight above-water torpedo tubes added.[22]
Regards, Phil